I just picked one up as a much less expensive option than a tilt/shift lens for the Pentax mount (they're hard to find and crazy expensive for the K-mount). I have done some experimental shots with it, discovering that I clearly need practice, but beyond that, does anyone have experience with these and have some tips to share?
I don't use a lensbaby and don't have any great resources for you, but seeing that the question has gone unanswered for so long, I'll post what I can...
Craig of The Mindful Eye uses a Lensbaby. Back in the day he posted more how-to stuff about using it, but there are some of his photos along with nuggets of info in his blog: