Bubble 2.0: "You went to a great party, had too good of a time, woke up with a terrible hangover, and promised yourself you wouldn't do that again. Then the people who threw the party invite you to the next one. What do you do?  Go, of course. I wonder if that's what's happening with all the activity in and around Web 2.0 right now."—Fred Wilson (Union Square Ventures)