Personally I use guitar rig 4 and the Kontrol rig interface and the MixCraft package (Garage Band type ssytem for PC's). The UI is much more useable and adjustable than the line 6 PoDxt. Not as many amps in the database but I find it much more usaeable. It has a ton of presets that include Blues classical, rock metal etc. I have learned so much more about tone shaping than using the Line 6 Pod apps.

I have been using the databases listed below to build out custom cabinets and tweaking the setting to dial in ac/dc ted nugent, van halen, sammy hagar etc.


Try these:

http://www.guitar-rigs.com/
http://www.guitargeek.com/