In case you haven't picked it up from just browsing around already, some stuff happened, namely a streak of bans, which resulted in
this website, where a lot of the current pros reside. There's also
Desura, which currently sells Dom 3, now that Shrapnel's stopped.
There are still plenty of games on Shrapnel, but a lot of the community here has also migrated over to those two forums (sans those who can't come back, of course). There are a bunch of other websites with a few games running, but those two are the big ones. I imagine you can find a game looking for players between these three sites. If not, host one! Llamaserver is the same as before and as ubiquitous as ever.
e: looks like you've already found both. Oh well.
e2: Just in case, you might also want to check out the
Dominions 3 IRC channel. You can find a lot of players looking for blitzes (fast 2-5 player games played in a single session) there. They're pretty fun, more people should try them out.