This is a major annoyance for me as well, especially since the Facebook app is still not available for the iPad I've been using the touch.facebook.com interface

This is a major annoyance for me as well, especially since the Facebook app is still not available for the iPad I've been using the touch.facebook.com interface instead, but each time I switch apps it has to reload the page and destroys any state as to where I was last/what I was looking at.