Sure, it's a case of someone being a friend whore, but I still thought it neat to be notified that Guy Kawasaki was following me on Twitter.
Since I only have one meat-space friend (Chris) that also uses Twitter, I just added a bunch of web celebrities (from Merlin Mann to Jeffrey Zeldman) to follow. No direct dialog, but still interesting to see their thoughts fly by.
See me on Twitter here.