I am beginner and looking for sites/blogs.
I love Digital Photography School. It has a variety of tips and interviews and challenges. Beginners and pros alike should check it out.
Personally, I read PhotoFocus at http://photofocus.com/
It's run by a photographer called Scott Bourne, and I have found it a very rich source of ideas, information, news, technique and just plain thought-provoking stuff.
He also publishes a podcast (same URL), which I also enjoy. The podcast is all Q&A, often with famous photographers as guests.
Luminous Landscape (http://luminous-landscape.com/). As the name suggests - strong orientation towards landscape photography and also equipment.
When I was a brand new photographer, Cambridge In Color was extremely helpful. Great articles, not too long, and not too technical (but they do cover technical concepts.)
Another great site, although much more loaded with content and a little harder to find specifics, is Digital Photography School. Beautifully designed site (as an ex graphic designer, I find this site a wonderful piece of work), it has plenty of information for any photographer.
As a nature photographer, I have always found NatureScapes.net's articles to be helpful. I am not sure if nature photography is an interest for you, but there is still a lot of useful general photography information in some of their articles.
Another great site, although again more geared towards nature, is ND Magazine. One of the main editors is one of my favorite photographers, Andy Mumford. It was after reading some of his articles on this site that I started following his work. Some excellent tips here on how to be an excellent photographer.
Another site that I frequently use is The Digital Picture. This site has EXCELLENT lens reviews. It was primarily a Canon site, but the author has started reviewing Nikon gear as well. Brand and off-brand lenses are covered in great detail by someone who has had extensive use of all the equipment reviewed.
I also follow Scott Kelby at http://www.scottkelby.com/blog/
I find that (apart from promoting his own training and books - which is not a bad thing) Scott gives a good load of news, and has a weekly guest blogger section, where another famous photographer writes an entry. These can be very thought-provoking and inspirational.
I personally found John Wright's entry extremely encouraging.
Chase Jarvis is an excellent resource for pro behind-the-scenes stuff, lots of excellent material available as a podcast.
I would also recommend The Art of Adventure Photography, Bruce Percy is a marvellous photographer with an amazing way of capturing the light.
Martin Bailey is an amazingly dedicated blogger and podcaster who is also worth checking out.
If you enjoy Strobist then you might also enjoy DIY Photography at http://www.diyphotography.net/
I find it's a bit varied, but there are some total gems when it comes to home-made photo gear and accessories.
Strobist is a great resource for all things flash-related. In addition to their excellent 101 series, they have great anecdotes and tips to help with tricky lighting situations.
Check out photo.net. It's probably among the oldest photography sites on the web. I've learned plenty from visiting it.
This Week in Photography is a weekly podcast discussing all things photo-related with a number of regular and guest professional and serious-amateur photographers, mainly from the US. Their new website, http://www.thisweekinphoto.com/, contains show-notes from all of the episodes they've recorded, plus articles written by the hosts on a range of photographical topics.
I really love Petavoxel. He uses his extensive knowledge of physics and photography to explain in very clear language how different camera manufacturer's choices lead to better or worse photographs. In particular, he specializes in myth-busting. For example, "back side illumination" isn't all that it's cracked up to be. And he's constantly focusing on sensor size and light sensitivity.
I have been blogging photography tips for 3 years or so, much of it is aimed at true beginners who are using Auto mode or just beginning to learn about manual controls, but other topics like image editing with Gimp are covered as well: http://blog.muddyboots.org/
If you're a Canon shooter interested in small flashes, then Syl Arena's speedliting.com is a good resource. It's fairly new, and still in development, but the "how to" section contains blog-like articles, and the "gear" section contains articles on choosing what gear to use.
There is also Syl's personal blog, pixsylated, although this is not purely photography focussed, but does include photography posts that aren't speedlite related (Topics covered include, for example, colour management).
I am surprised that Petapixel has not been suggested yet
Here is a bundle from Google Reader that I follow:
I will try to compile another one with any others that look interesting from answeres.
I would recommend:
I have enjoyed Tangents by Neil van Niekirk for its articles on lighting, especially about using on-camera flash for getting good light fast (essential on indoor events).
The "Digital Rev TV" Youtube Channel is always worth a visit. Not so much for technical advice, although they are testing gear all the time (admittedly in their own way). This one is rather for remembering what photography should be foremost, beginners in particular: A bucket full of fun!
Not a blog, but a mailing list: Photography Beginners. They've been around since 2001, and provide a good environment for folks just learning about photography, composition, and the nuts and bolts of their cameras.
http://goingpro2010.com is an awesome resource as well, not so much for photography tips per say, but more for what you'd need to do to make money from photography, and what to do when you've got people asking you to take their pictures for some occasion or another.
Jonathan Cherry "Mull It Over". Every week or so, he interviews an emerging photographer and links to his/her gallery. A great way to discover new talents. At the end of the day, the path to be a better photographer goes through watching A LOT of other people pictures.
Don't forget to subscribe to the D-Town TV podcast as well.
It's not much of a blog, but National Geographic has some truly inspirational photos worth watching.
Photo equipment distributor Manfrotto has what they call an "on-line school", the Manfrotto School of Excellence. This has a series of articles from professional photographers and writers, including Michael Freeman, and apparently Scott Kelby is signed up for 2011. There's several sections of the site; some are overtly related to Manfrotto products and promotion, but others are general-interest photography. Particularly interesting sections are: