The only one who contaminates the various Dominions communities with their disease is you.
And someone asked you about the other Dominions 3 communities, not for YOU to judge whether they were worthy of knowing about them.
@ dfs - If you want to know about Dominions related stuff, then you are better off asking someone who genuinely knows about it, and more importantly, is willing to share it. Don’t listen to the preachings of false prophets who have to feign a position of importance in the Dominions community in order to be heard.
And so for those interested, here are some of the other active Dom3 communities that exist out there. (not a complete list, but chunky enough to get by on)
The Gaming Den - They play almost exclusively vanilla games, although they have recently tried a few different game formats (Draft games). A few old faces from Shrapnel have taken up residence here. Namely Frank Trollman, K, and Dr.Praetorious.
http://www.tgdmb.com/viewforum.php?f=3
BrokenForum - I think Nate can tell you all about this one.
Dom3mods - They play mostly CBM games here, and is currently the main home of CBM development. This is also a good place to go for accurate reference resources, and is where momfreek’s brower utility is currently being developed. A lot of faces from Shrapnel live here such as Sombre, llamabeast, Maerlande, and me, Calahan.
http://z7.invisionfree.com/Dom3mods/index.php
Absolute Games (Russian) - Don’t think this community is active anymore (or at least not on this site). Some familiar Shrapnel faces used to play here such as the long time veterans Ano, Dimaz, WingedDog, Kuritza, Karnoza (there are a LOT of Russian players who are seriously good at the game). The playing community seems to have migrated to the dedicated Dominions3 forum that is coming up next.
http://forums.ag.ru/?board=fl_main&action=display&s=50&num=1098250079
Un-named Russian Community (Russian) - It seems the players from Absolute Games have moved here. Don’t know anything about this forum apart from recognising a few names (past and present) from Shrapnel. (and they play CBM judging by the game list)
http://dominions.ucoz.ru/forum/
Paradox Dominions Community - You will need to be a registered member to view the thread, and if I understand correctly, you also need to have a game registered as well (to view the thread). It appears they run at most 1-2 games at a time (Wetfeet/foot series of games on llamaserver), and Peter Ebbesen and Jarkko are the familiar Shrapnel faces that play there.
http://forum.paradoxplaza.com/forum/showthread.php?470289-Introduction-to-Dominions3-get-your-feet-wet-in-MP
Bay12 - Very smilar to Paradox. They run 1-2 games at a time (series of games with the Bay12 prefix on llamaserver). I don’t know much about the community though and I don’t see any gnarly old vets there that I recognise.
http://www.bay12forums.com/smf/index.php?board=21.0
Punta de Lanza (Spanish) - You need to be registered to view the thread. Another community I don’t know much about, apart from recognising a few names from Shrapnel
http://www.puntadelanza.net/Foro/phpBB3/viewforum.php?f=56
Something Awful - Gandalf gave the link to their server (brainwinkle), but not to the Mega thread they use (or one of those they use). This is regarded as just about the most active community out there, and they experiment with a wide variety of different game formats. They also have they own series of mods (Awesome mods). Their Mega thread (linked) sometimes becomes available to members only for a period of time though, so if you want uninterrupted access to the Mega thread (and their other Dom3 threads and archives) then you need to register at Something Awful (costs a nominal fee of $5 IIRC).
http://forums.somethingawful.com/showthread.php?threadid=3498147
There are also two dedicted IRC channels. Both of them are fairly active, and both of them are to be recommended to anyone looking for help and advice about the game (also useful if you need quick answers)
One of them run by the Something Awful crowd (info on the Mega thread link above, or here is the direct mibbit link)
http://widget02.mibbit.com/?server=irc.synirc.net&channel=%23dom3goons&nick=dom3goon_%3F%3F%3F
The other IRC channel is mainly the Dom3mods crowd, with guests from Shrapnel and SA (Something Awful). Here is the info about this channel. http://z7.invisionfree.com/Dom3mods/index.php?showtopic=25
And here is the direct mibbit link for it. http://widget01.mibbit.com/?server=irc.gamesurge.net&channel=%23dominions&noServerTab=false¬icesToActiveTab=false
I seem to recall there being a few other communities as well, but haven’t got convenient links to them (Google would likely find them if you had a bit of dedication). Fairly sure there is an active French community, as a few Shrapnel old timers play there (LDiCesare IIRC). There are forums dedicated to other games that sometimes run a Dominions game. The Stardock forums I know had a few Dom games at one time, and IIRC CivFanatics had the odd game now and then as well. A couple of other forums had discussions about Dom3, but can’t recall many that turned that chatter into a game (or at least not regular games).