Security

I'm always amazed at the lack of demand for security training (especially given the amount of money someone can make with a top certification). The main course (it's even required by the Department of Defense) is Comptia's Security+. Here is a free study guide to get you started.

EC Council is the home of Certified Ethical Hacker certification. Sans website is also the gold standard for advanced security training and certification.Cisco is also a player in security certification.

Finally here is a cool little site for some specific security tutorials.

Security certification is always going to be dependent on experience first, but add in a few acronyms and you could see a giant leap in your paycheck!