Just wondering, why don't we have a voice server like a Teamspeak or Mumble one for the community, when we have got all these game servers already (UT, Minecraft, TF2 etc.)?

Would be nice to chat with you about old and current games alike. =)

There was a Mumble server once but I don't know if anyone used it.

We do have a Mumble server set up (Mumble 1.2.0 minimum); you can find it at
IP: 195.90.99.195
PORT: 60030

A group of people from the #gog IRC channel used to hang around there at times and we may even start doing that again.

As for why it's not used anymore, it's because all-talk is set up on the TF2 server which means that anyone can hear what anyone says :D