most already know about www.baseball-almanac.com and www.baseball-reference.com . the 2 are invaluable for looking up player data, uniform numbers, transaction and dates, and box scores from almost any mlb game ever played. i've found a few other useful sites. baseballcube.com is especially interesting as it contains minor league and college rosters from almost any year and club. (navigation is on the right hand side).

http://www.thebaseballcube.com/

http://www.sports-reference.com/

http://www.baseballlibrary.com/homepage/

rudy.