TIPC is a LAN protocol, originally designed by Jon Maloy at Ericsson. Its purpose is to provide an efficient, transparent, and scalable communication mechanism for a wide range of possible cluster configurations. It has been in the linux kernel since 2.6.16.
http://tipc.sf.net is the main TIPC site.
The TIPC community is just starting to use this wiki, so there isn't much content here yet. Please feel free to contribute once you have an account here: http://linux-net.osdl.org/index.php?title=Special:Userlogin&returnto=Main_Page
Here's the TIPC FAQ
TIPC is under active development. Some of the features that need to be worked on include: