My suggestion is to read the User Guide pdf. It is on the disc you use to install Photshop. It has pretty much everything you need to know to slice up any image you make. There are not many free advanced tutorials out there that I have come across. Most are just basic skills.
Do you have links to any sites as example of what you want to do?
[size=1]"If you want to be "in the biz" you are going to have to roll with the changes or get out, basically."