Hugh Macleod of gapingvoid fame has just published his "10 things I hate about web 2.0" which (despite the americanisms) made me smile a lot especially number 6 (below) after a recent conference experience (more on that in a day or 2):

6. People at conference panels, pretending that the only reason they're attending is to offer valuable insight to their fellow man, as opposed to just pimping their wares and/or scouting for consulting gigs.

Definitely worth a read particularly the comments posted in response.