Here's an article demonstrating how creative fakes are being made: http://www.coinnews.net/2009/10/27/pcgs-helps-police-nab-counterfeits-suspect/
I like to see headlines like this, getting another one of these thugs behind bars. The problem is, I wonder how many of these guys are out there who haven't been caught yet. A good hobby is supposed to be somewhat of a stress reliever. I'm starting to stress out every time I decide to make a sizable purchase. A TPG used to be a safeguard against counterfeits and altered coins. Now, they are altering and counterfeiting TPG's. GOOD GRIEF is right!