Can't say I check Usenet an awful lot, and the bits I do check don't involve MUDs (mostly the rec.games.roguelike bits). As one of the mods of this wee group, I wouldn't like to take the job on of crossposting there, but if anyone feels like shifting relevant post to rec.games.mud.announce or whatever the appropriate group is, feel free.
For future reference, I'd say the two places most likely to post news about such things would either be MUDconnector
or Top MUD Sites
, especially the latter, as we have an active voting thing going on there. MUDconnector also has a proxy system so you can check if the MUD is really up, rather than there just being a dodgy router between you and it.
Compared to those two sites, this LJ forum is a poor man's third choice. We're only here for idle gossip and speculation, really ;)