There's a new retro keeper league forming at http://forums.sportingnews.com/viewtopic.php?t=600671
In order to prepare for the league draft, I've been poking around the TSN/SOM site. There's actually a lot of information available, although it's not organized very well.
Here are the links to review the players available for the various years:
2001:
http://fantasygames.sportingnews.com/baseball/stratomatic/2001/draft/research.html?position_id=1
2002:
http://fantasygames.sportingnews.com/baseball/stratomatic/2002/draft/research.html?position_id=1
2003:
http://fantasygames.sportingnews.com/baseball/stratomatic/2003/draft/research.html?position_id=1
2004:
http://fantasygames.sportingnews.com/baseball/stratomatic/2005/draft/research.html?position_id=1
2005:
http://fantasygames.sportingnews.com/baseball/stratomatic/2006/draft/research.html?position_id=1
2006:
http://fantasygames.sportingnews.com/baseball/stratomatic/2007/about/research.html
2007:
http://fantasygames.sportingnews.com/stratomatic/about/research.html?pool_id=2007
2008:
http://fantasygames.sportingnews.com/stratomatic/about/research.html?pool_id=2008