I've recently came across an image similar to this: (Source: travmonkey)
And was really impressed, the picture I found before that one (sadly can't find it again) looking even better, with a really beautiful linear motion blurred background and a crystal clear subject on a bike in the foreground.
Having no idea at all how this could've been produced I looked around and found the site linked in the image source above, however it doesn't say much other than that one has to pan the camera.
Looking a bit around on this site revealed that "second-rear curtain flash" is also used a lot for these kind of images, as per this Q&A. However, in bright daylight I don't think the flash method will have much effect, but panning the camera seems like a really hard task to me.
I have yet to try it out but given the picture above, wouldn't one have to move the camera at the exact same speed as the bike is going? Or is there post-editing in play too? What I specifically don't understand is how there can be no blur on the biker at all, not even the tiniest bit.
If someone could enlighten me on how to do shots like this and what tips and tricks there are to make it easier and better that'd be amazing.