If you are a citizen of Second Life and miss using it when you shifted to Linux, then don't despair. The beta version of the Second Life Linux client is now available for download. At close to 53MB download, this client now allows users to have 3D voice support and multi-media playback along with improvements and bug fixes.
As with other beta software, this is not close to production. However, testers like you are encouraged to use it and report bugs so it will be fixed before the final production version is released. What are you waiting for? :)