I've been doing alot of different things lately. At home I've been hacking around with the openMosix userland code. I would like to hack around with the openMosix kernel patch and code but I dont know the linux kernel yet. I'll learn it sooner or later.
At work I've been messing with drbd (http://www.complang.tuwien.ac.at/reisner/drbd/) and heartbeat (http://www.linux-ha.org/) for a HA Linux NFS server. It's all working well now. I'm stress testing it today. I made a program that copies and deletes files on the drbd partition. Seems pretty stable so far and replication is working. The initial sync is a little slow though. The failover works pretty well too. It takes about 20 seconds or less to failover.