Dunno if anybody's ever seen this one, but it had me kinda creeped out for a bit until I figured it out:
Online card trick (http://www.caveofmagic.com/zndex.html)

Enjoy. :)

I think it's pretty obvious how it works, but it might catch some people.

Yeah, I only figured it out on the second go.

I semi-memorised all the cards anyway in trying to decide which one to pick, so it was pretty obvious.

How does it work?

O nvm, I see lol.!

What about this one?
http://www.simeonmagic.com/triangle/triangle1.htm

Half of those links don't work...

Seen it before :p do you want the answer?

yea what is the answer