I know there are forums more closely aligned with this topic, but I figure that EL34 (and likely others) have experienced pretty much everything that I'll need explained in order to make this an interesting thread...
I'm very near to the point of launching a forum related to my work. It has to be secure, i.e. SSL connections requiring user log in, and not publicly browseable (well, that's the way samba spells it). It seems the Simple Machines solution is pretty popular, which also happens to be the platform we're on now. I'm leaning that way mostly, though, because I'm kind of hoping to be able ask Doug for advice when I get in over my head.
A few more tidbits: I have possession of the server that the forum will reside on (LAMP) and plenty of bandwidth (~20-50Mbps). I'll be expecting not more than 130 or so members total, not all of which will even sign up, much less participate. I'd like to allow attachment uploads, but probably with about the same restrictions we have here as to formats, file sizes, etc. I don't know yet what those criteria ought to be exactly. I also don't know where I should draw the line as to how long to let content sit there before it's allowed to fade into the aether and be overwritten. I know Linux servers and LAMP applications, but I've never done this specific thing before.
Any and all suggestions for a noob would be greatly appreciated... You can tell I'm a noob because I don't really even know what I should be asking at this point.