I'll second all the bank comments. My own bank is horrible and has no way of escaping from statement view without logging back in (same with print friendly pages).

Of all the others, the one that got me most recently was Skype. Trying to upgrade my account, I spent a good half hour trying to figure out which links did what (some go to help, others to order pages). It's never entirely clear that you are buying what you think you are until you get to final payment page.