Rosters are the list of eligible players who can play for a team.
MLB rules state that there can be 25 active players on a team, in September teams are allowed to expand their rosters to 40 players
Go to MLB.com and click on the team(s) in which you are interested. each team's sites have a list of all time rosters.
A Major League Baseball team optioning one of their players means they are sending a player that is on their 40-man roster back to one of their Minor League Baseball rosters, players that are not on their 40-man rosters are not optioned to one of the team's Minor League rosters instead they will just be re-assigned to their Minor League rosters during Spring Training.
that one team with the hats
Playoff rosters are limited to 25 players.
Major League Baseball rosters consist of 25 players from the start of the season in early April until August 31. As of September 1, teams are allowed to expand their rosters to 40 players until the season ends (usually first week of October).
The free agent signing period begins in March. Under the new collective bargaining agreement, during the offseason teams will be able to expand their rosters to 90 players.
http://espn.go.com/ always has rosters for just about every team and sport.
Anything you want, i guess you can save the rosters if you want.