I think this brings up an interesting point of discussion: what should sites do now and what should they do later? In this case, a quick server-side check that

I think this brings up an interesting point of discussion: what should sites do now and what should they do later? In this case, a quick server-side check that did the same thing as a client-side validation seems like a no brainier, but what about bigger, more complex actions? What kinds of actions are you guys deferring while actually telling the customer something else (and notifying them later if something ultimately fails)?