How to learn linux
It made me
pleased 
"well worth adding to my skill set"
How I did it: i learn by jumping right in to it with red hat, think it was version 4.3 not sure, but it was way before fedora or redhat started releasing it with enterprise in the title.
I switched to mandrake and then once i started to make my way on the command line i switched to slackware
hardcore, yeah!
Lessons & tips: try to set goals so you can check things off your list as you go.
Resources: Google as alway's is a good place to begin.
also try www.linuxquestions.org
