i think you still have to confirm them. they have some new thing where they are sending friend requests to your contacts....annoying. when i looked at my friends list i had a bunch of friend requests that i did not request as friends. but i still have to approve/confirm the add.
it might be reading your email list if you connected it when you first signed up i had several of those and they didn't show up in the top right hand corner. i think it's because the person themselves didn't actually request it but the computer did...does that make sense?
It won't show it in the top right hand corner if someone uploaded their email contacts when they joined facebook. Say for instance you have a facebook account and then that person joins and uploads their email address book. It will show in your friends list awaiting friendship thingy but not in the right hand corner. It means that person did not physically go search for you and request your friendship but it did a search of their email contacts and did it that way.
Also if you uploaded your email addresses, anytime someone from there joins F/B, it will automatically see them and put that person in your friends list awaiting friendship.
However, if someone physically requests you as their friend, it should still show up in the top right hand corner. I clicked off the ones in my friends list. If someone wants to be my friend I figure they will go to the trouble on their own to ask.