Torn Too is actually demonstrated in Torn - Torn is quite good, but isn't for me because I don't use bicycles that much and although it's visual, the backs of my cards with giveaway the effect. I could tweak it but am now using Torched and Restored.
Torn is quite good, I heard quite a bit of bad things about Torn Too though...if you want to do a trick with the corner of the cards you could try Angle Z by Daniel Madison (Jay Sankey on his Hardcore DVD teaches the bare bones version of this).
Okay, enough blabbering, basically Torn is a good stand-up visual trick, can be examined and signed, but is a bit touchy on angles so the audience can't be too close or surrounded. It isn't that hard but one slip could screw you up.