Yes, kat, it has been mentioned here before. When it first came out, I (and I thought you) tried to set it up with no success. If I remember correctly, there were problems with their initial set up and they had to start again. I think it did crop up in conversation again here but I can't remember the outcome.I would doubt that a maximum of 50 simultaneous users (between the 5 possible rooms) would be a problem with Mudcat - I would guess the highest we have hit so far with soley Mudcat participants would be in the Concert room at maybe about 30.
I think it is unlikely that there will be any need to worry about admin controls (although it is nice to have them) if the web pages are kept private. Although I did welcome the oppertunities PalTalk offered with that sort of control to welcome strangers in and indeed meet new people both ways, the fact of the matter is we operated Hearme which had no such controls for quite a while and I can't remember getting any problems with unwelcome intruders by giving the links here.
One possible worry related to that would be whereas with Hearme, I could (but never needed to) relocate the page just by uploading a new version elsewhere, I have a feeling this system requires the registration of individual web pages on their system and I'm not sure what that involves when changes are needed later.
I guess that bottom line is that it does use the Hearme Technology which has worked for us before and it's free - it has to be worth another look.
Jon