Lawrence Lessig, someone that I've come to trust as a fighter for decency and intelligence, put together a 20 minute persuasive video on why he supports Obama. It's worth a watch. (Lawrence Lessig has been Obama's adviser on technology-related issues, by the way.)
Lessig posted a little bit later a YouTube music video of Obama's Yes, We Can speech. Also worth a watch.
I haven't spent much time forming an opinion for the primary as Kentucky doesn't have much of a voice in the weird caucus system that we see today. I do find myself leaning towards Obama over Clinton, particularly because of his involvement with Lawrence Lessig.