A cool plugin for amp modeling: "AmpliTube Amp Simulato
This plugin works with most of the sound editing prograns sutch as Cooledit or Soundforge. It's like a software based POD. the interface includes cabinet types, tube/valvestate selection, tube clean/overdrive models and alot more.
also some nice FX rig wich includes delay/chorus/wah/reverb (tube or regular),flanger and more.
This is a pretty cool tool..
here are some samples of guitar sounds (pre-processed and processed)
for more sampels