Yahoo is one the the best fanatasy baseball platforms. The app is currently optimized for iPhone and it gives you real time updates for your favorite Yahoo fantasy sport. You can set up your lineup for today's fame or upcoming games. You can also track matchups for old games or games coming up in your schedule. You can also improve your lineup by adding new players and reading up on up to date player news.
Yahoo offers in depth fantasy baseball player ratings. Check them out here
Yahoo! provides a mock draft lobby where fantasy baseball owners can practice their draft strategy against other players. Multiple draft formats are supported including standard snake drafts & auctions. You can also import rankings to help guide your picks.
Mock Draft Lobby
Yahoo Tourney Pick'em, Fantasy Football, Basketball, Hockey, and Baseball by Yahoo