I taught myself how to shoot in manual, but this is a great tutorial if you have no clue what you are doing! She gives great examples and explains things very clearly. Good read.
Also on these boards
How to shoot in manual mode - the basics
what i learned in my 4th year of shooting in manual mode
8 Tips for Backlighting via Click it Up a Notch
photography tips--Having a DSLR and never shooting in manual mode is like having wall to wall carpet in your living room when there are hardwood floors underneath! It's straight up crazy town! Your camera can do SO much and you CAN shoot in manual mode. If I can do it - there's no doubt that anyone can.