[PhilD]

Basically, if we're talking PBEM games and not TCP, the server should not need any more resources to run X games than one - dom3 itself will not be running full time, just while hosting, and even if there are many games running in parallel the server can manage them and only run one instance of dom3 at a time (requires a bit more careful programming, not that terrible).

TCP games are a totally different matter, and the answer will depend a lot on how efficient memory management is in dom3. Will several instances share memory? this kind of question. But I'm not sure how useful a TCP-games server would be.