Operating Systems (3rd Edition), Deitel -- is an excellent way to fill in gaps in your understanding of the OS. Don't buy it new -- used copies can be found on

Operating Systems (3rd Edition), Deitel -- is an excellent way to fill in gaps in your understanding of the OS. Don't buy it new -- used copies can be found on amazon for less than $20. Learn a radically different programming language: Common Lisp. Seibel's Practical Common Lisp is a very good introduction -- Keene's Object-Oriented Programming in Common Lisp will give you a wildly different way of looking at OO -- The Art of the Metaobject Protocol will forever change any preconceived notions you might have regarding objects.