I found myself playing Sim City 2000 for a while after reading this thread. Won't be possible with this one, I guess, because eventually, they WILL shut down the service.
That's what I hate about online games (any game that requires online connection, for DRM purposes or multiplayer) the most. You buy it, but you can't keep it as long as you like. You can only play it as long as the company has the online service up and running.