http://www.pbw.cc for all your gaming needs. Still quite active. Even newbies games starting up still. [img]/threads/images/graemlins/wink.gif[/img]
The AI in the TDM Modpack is much stronger than in stock and still gives many veterans a run for their money, with the right game settings. I don't play solo anymore, so I don't recall those settings off-hand.
Many people enjoy my Quadrant Mod, as it gives much more intereting maps to play on:
http://fqm.spaceempires.net/