I tried it and almost every site I usually visit seemed to load the full desktop version. The two exceptions I found was NBC.com and Gmail. Gmail did have a link at the bottom so I could go to the desktop version, but it still wasn't the full desktop version, since it didn't have the chat feature. Anyone know if the gmail chat feature is supported on the ipad? I'm not sure what type of plugin is used for that.
I'll have to take a pass as I don't use Google mail. However I would be surprised if they had to use a plugin for chat. Plain in-browser AJAX should be able to do the trick.