I was in the same boat in July of 2006 except the song count was more like 80(with some I knew). OK, here's what I did and still do when the "we play that in C not in D" etc happens:
1) Download Goldwave:
http://www.goldwave.com/features.php
and the required mp3 converter piece "Lame":
http://lame.sourceforge.net/index.php
2) For the "change keys" or move to E songs(Van Halen, SRV's), use the Pitch Shift function. BEFORE YOU DO THIS, WRITE DOWN THE SONG LENGTH in minutes & seconds(use in next step)
3) Restore the tempo with the Time Warp function by changing the Pitch Shifted length to the original length USING THE SONG LENGTH written down in step 2 with the DURATION adjustment. Make SURE you save them at 160kbps mp3 or better. The Time Warp function WILL make some things sound different but the bass will remain ok.
4) Save all of the songs in mp3 to one folder on your hard drive
4) Dump that folder onto either a CD player(data files, mp3) or mp3 player of choice(we use Creative M ones
http://www.amazon.com/Creative-Zen-...9?ie=UTF8&s=electronics&qid=1193089990&sr=8-5 ).
5) Listen to NOTHING but those songs PERIOD, ALL THE TIME.
6) Set up a home practice deal with a POD or other similar device to "play along with" the stuff:
You can also "fix" song levels with Goldwave with the Edit Volume functions:
Final suggestions:
Learn songs
sitting down,
practice them once learned
STANDING UP as you would at a gig. BIG difference.
For endurance,
practice for at least an hour or two at a time(
standing practice, not figuring out time). I've done 5 hours straight(at my age) on weekends when I could and it SURE came in handy for that 3 hour and 40+ minute set we did at one show. Makes a 50 minute set a breeze.
It is a challenge.
Best of luck and, most important of all, have FUN meeting the challenge!
You don't have to play with any audio files, just activate the plugin, set the tempo and speed you want and play the song. That's it. 
