We're starting a new sim baseball league at the South Side Sox blog (White Sox SBN blog). I claimed the Orioles, but I'm willing to take another team if someone else wants the O's (or you're welcome to one of the other open teams).
It's free to play. You control your line-up, make trades, sign free agents. Sims twice a day. If you check your team once a day you should be fine (skipping a few days shouldn't hurt your team any).
The "Southside Second Option" sim league will begin with the 2006 season. Cities are equalized, so the damn Yankees won't have a financial advantage.
If you want to join, you'll need the league password. Email our commish and he'll set you up. firstname.lastname@example.org
After you get the password, go to http://www.baseball-manager-online.com/. Click "join now". Fill out the form and click submit. Click "verify signup", don't wait for a verification email because you won't get one. It will send you to a log in screen. Enter your username and password. Click "search for a premium league". Type "south" in the search for league name box. Make sure you check the "Show leagues with passwords" box! it will find our South Side Sox league. Enter the password and click join.
If you have questions, post them here and I'll be happy to answer.