Quite a few guitarists want to learn songs by hearing them played at a considerably slower speed. Here are some downloads to check out if you're into that sort of thing.

Amazing Slow Downer 1.19 - Slow down music without changing the pitch
http://www.hitsquad.com/smm/programs/AmazingSlowDowner/

Denzo Music Editor 1.2 - Denzo Music Editor 1.2
http://www.hitsquad.com/smm/programs/Denzo_MusicEditor/

Music Analyzer - A multimedia player which can play slowly without changing its pitch
http://www.hitsquad.com/smm/programs/MusicAnalyzer/

SlowGold II 7.0.31 - SlowGold lets you play along with great riffs and tunes at the original pitch, at your own speed.
http://www.hitsquad.com/smm/programs/Slowgold/

More software at http://www.hitsquad.com/smm/win95/GUITAR/