The original teaching site can be found at
www.virtualmagicshow.com/chips (I was the first to put actual teaching clips up - and I still am). There is a lively community over at
www.21ace.com where you can learn even more moves.
There are three commercial products out there, I have a CD called Basic Chip Tricks, Rich Ferguson has a DVD and Tom (last name escapes me) has another.
There's also a site called chiptricks.com, but I've had little contact with the owner of that one (he's unusually absent from the general scene, as it were).
Hope that helps,
Ian