Just thought I’d let everyone know where I learned everything I know about workflows. This site is friggin awesome, and the tutorials are very detailed. You can tell that this guy, Stephen, put a lot of work into this.
http://office.microsoft.com/en-us/sharepointdesigner/HA102564171033.aspx
Then, just recently, by popular demand, he posted all of the associated files that he used in his demo!!
It might take half a day, but I recommend that you go through all of his tutorials when you get a chance.