I was playing around a bit with Mumble today, so I thought: "why not?".
For the time being, I'll be hosting a public mumble server over at the scrapyard. Use it for your guild meetings, runs, non-intimite conversations.
Please note: I provide this service for free, using spare resources. Please don't use it to stream music and don't ask me to act as kindergarden teacher.
This is cool beans! Another thing I can recommend for people who want a proper voice chat service for SK is RaidCall, which doesn't require any server hosting payments.