Barnes and Noble is having a good sale on discount books. Buy 2 books and get free shipping. They have the "Running Linux" book for only about $7. Add another book cheap book and you'll get free shipping, only pay tax. I picked up another cheap book for $5 or so and paid $11.xx shipped to my door.

www.bn.com (US customers only I believe)

This books is good for those who are new to system admininstration or those who are more knowledgable but need that extra help when times comes.