Web Developers and Linux
If you're a web developer or designer, you may not run a form of Linux as your development environment, but you still have your websites hosted on a Linux server and have to do some administration of it.
The folks at Search Engine Optimization company SEOmoz are also in the same boat, i guess, and one of them shared a whole bunch of invaluable stuff that I can use when administrating my Linux server. After this, SSH will become even more of your friend, I guarantee it.
I learned how I could pause a task that's running, how to keep that running even after you logout, and how to save the task output to a log file. Really, if you use Linux a bit, you should read it.