The job of a system's administrator involves continually learning and keeping up to date with technology which affects their work. Thus, it's a good idea to have a handful of resources to refer to in order to track what's happening out there.

Some good web sites to become familiar with include:

http://www.freshmeat.net/

Lots of software, both new and updated releases, are announced here.

http://www.slashdot.org/

"News for Nerds. Stuff that Matters."

http://www.sage.org/

The System Administrator's Guild, affiliated with the Usenix Association. They have several nice booklets and a hard copy magazine, called ";login:", specifically for system administrators!