Thanks for the advice everyone. As I'm really not going to be thinking of moving for another year or so, I have the time, but more than that I really would like the knowledge. I have a good grasp of networking and security, but I can't help but imagine I probably have gaping holes too.
Plus, it seems impressive to have acronyms after your email signature
Can anyone recommend any good CCNA books (preferably with a lab work CD included)?