Stuff that helped me, in addition to LQ itself (I'll limit myself to a few items):
Good general intro:
http://linux.about.com/
Garrell's
Introduction to Linux. This book helped me tremendously. It's a longer book, but readable. I printed it out and still have a copy on my bookshelf.
Although it is oriented towards Slackware, the Slackbook is a good basic primer:
Slackware Linux Essentials. I actually purchased a copy from the Slackware Store.
I started with Slackware and found a lot of help in the Slackware newsgroup, alt.os.linux.slackware. Unfortunately, I cannot recommend alt.os.linux.ubuntu--the signal to noise ratio is too high.
I also found googling to be very helpful, especially when I added "slackware" or "linux" to the search string (or, for my ubuntu box, "ubuntu").
