I've just looked at the "full site" link, and it's a bloody javascript command, not a hyperlink... crap... maybe someone smarter than me can figure this out.

It annoys me that if you go to m.facebook.com, you get the mobile version...
If you go to touch.facebook.com, you get a slightly better mobile version...
Nothing that sends you to the full site though (although 0.facebook.com is a new thing that works for some carriers - just not mine)