Check out

http://www.8thstreet.com/digitech-store.asp

and have a look around.

Also:
http://www.digitech.com/

You can usually find samples (mp3.. not the best) to down load of what the various patches can sound like

I really like Digitech, I use the GNX2 and record direct from it.

I also like the POD by Line 6 though that is more expensive!