Learning Linux

I am looking to take the RHCT in late September and as such have been keeping my eyes open for tutorials to study. 

One of the best links I found was RHCE 2 B an RHCE prep site with several useful tutorials. It looks like the best RHCE prep book available currently is this one, and although they are not RHCE tutorials; IBM has been running a series of tests for the LPI certification that seems to cover much of the same material.  I have copied the articles (in pdf form) locally:

This should keep me busy over the weekend.