The last tech conference I was at was Google IO in 2008. I wasn't able to go this year, but hopefully I will be able to go back in 2010. Another conference that I would like to go to is Le Web. Even though this conference is for Europe it brings together speakers from the top US tech companies.
Usually, you don't go to a tech conference for the content because you can get that online. Most tech conferences live stream or post videos online after it's over. The real benefit to going to something like this is to network and meet people in your industry which is something you can't do by watching the videos. Another reason to go to Le Web is because it is held in Paris, France. An expensive but possibly a very fun trip.
North America is currently the leader in web services but I have a feeling that Europe isn't too far behind. I can say from personal experience that European companies can be a great resource to partner with and outsource to.
Platform Roundtable
Michael Arrington, Editor, TechCrunch
Ethan Beard, Director, Facebook Developer Network, Facebook
Cristian Cussen, Director of Business Development, Ning
Brandon Duncan, Director of Platform Engineering, LinkedIn
John Ham, Co-founder & CEO, Ustream
David Jacobs, Vice President, SixApart, Ltd.
Mike Jones, COO, MySpace
Ryan Sarver, Director of Platform, Twitter
Some of my other favorites:
Ethan Beard, Director, Facebook Developer Network, Facebook
Ryan Sarver, Director of Platform, Twitter
Fireside Chat with Marissa Mayer, VP Google
Tony Hsieh, CEO, Zappos.com
Timothy Ferriss, Author, The 4 Hour Workweek
Fireside Chat with Gary Vaynerchuk, Wine Library TV
Gillmor Gang Live