This page collects a list of independent resources for UNIX information.
Vinayak Prabhu pointed out an online guide to UNIX at www.informit.com. After you make an account with them at http://www.informit.com/myinformit/login/, click on the "free library" link --- the guide should be there.
Keelan Evans has found a guide to setting up SSH stuff here: http://www.tac.nyc.ny.us/~kim/ssh/.