If you're into Linux check out the ERTOS sysadmin job. Based at UNSW I can guarantee that if you're into Linux and open source you will not find a better work environment. I'm still constantly surprised by the bright people around me, and there's heaps of unique opportunities here. This isn't supporting Windows users ... you'll be hacking together solutions to problems you didn't know existed!
Feel free to contact me if you have any questions.