Does "Web 2.0" mean anything?

"Does "Web 2.0" mean anything? Till recently I thought it didn't, but the truth turns out to be more complicated. Originally, yes, it was meaningless. Now it seems to have acquired a meaning."

It could all still be hype & lingo, but for me, web 2.0 gets down to giving a voice to individuals (see Paul Graham's section on 'Democracy').