I'd appreciate any and all feedback, particular wrt market positioning and differentiation.

Yak will have the classic chicken-and-egg problem of being kinda lame prior to having a critical mass of users. Any ideas of how to jump-start growth are welcomed.

As a way of saying thanks, I'll give the top-rated commenter here (after 24 hours) 1,000 Yak Credits, and every other commenter with positive points 100 credits.