Currently there is no forum at nurgle.muschamp.ca and it is unlikely to change any time soon. There are several reasons for this:
Some people may be aware of another Nurgle website which does have a forum. I don't have a high opinion of that place. It could be because every few months some person I've never met sees fit to insult me. It isn't even one person. They don't know me. They aren't winning any friends, and now they're being mocked on my domain. Congratulations.
For the record my proposed third GT army has zero manreapers in it. I have two reaper autocannons which is both legal and the only way a troop with the mark of nurgle can get a gun that shoots over 24 inches. Being able to shoot over 24 inches is a good thing, especially being able to move and shoot over 24 inches. It is obvious that pestis and Morbo have difficulty with the English language. The latter can't even spell the only word in his one word post. Can I get anyone to "Seconed" that?
There is a reason I don't frequent that forum, but if people want to insult me, well that makes them fair game to be publicly mocked IMHO. You should never argue with an idiot though, people might not be able to tell the difference, so I took my screenshot and like Val Kilmer in Tombstone:
"I'll make ya famous."
Although it seems to have suffered an exodus due to people getting older, finding new hobbies, and the rise of alternatives, I'm still a fan of the original 40K mailing list. This is where I will always notify first after I update my website.
Due to the easiness which they can be created there are plenty of Yahoo Groups dealing with gaming. Technically I am a member of the 40K Chaos Group but I do not subscribe to it so am ignorant on what they are currently talking about. I think the riff-raff ratio is very high in this group. Although Yahoo Groups are a combination of a forum and a mailing list they are also galleries. Another Yahoo group I am currently subscribed to that has some sweet galleries is: Masterclass Miniature Painters. In addition to the galleries this group is policed/moderated well. A final 40K related Yahoo group that I'm currently a member of is Warhammer 40K Japan.
Although slightly more work, the rise of open source often PHP based board software, has caused forums to spring up like weeds. The following is a list of ones I have actually joined which implies I also posted at least once, though I don't follow any of them daily or even weekly.
If you still feel the need for interactivness and good old fashioned email is too passé for you, I have recently put up a blog. You could go there and leave a comment, eventually there may be some Nurgle or 40K related content there but that isn't the focus of my life right now, if it ever was.