Below will give you 75% what you need to know in Finance:
http://www.amazon.com/Investments-Zv...7996740&sr=8-3
Since you do IT, you should be pretty smart and pick things up quickly.
Another good book (and I like this much more than Investments, but its probably at a higher level) is
http://www.amazon.com/Principles-Cor...7996850&sr=1-3
I've used both these books in my university coursework studies for my Finance major. I work in a financial firm as well. My only concern is they may be slightly advanced, but I don't know any intro books sorry