Here is a collection of threads you may want to check out while here. If you think there should be other threads in this index, feel free to post them here and if necessary, I will add them in. This is not a discussion thread, do not post here unless adding a link.
ST:Tech: Photoshop Rules
All of the rules you should learn and follow before posting in this forum.
Photoshop Help Thread
Are you struggling with a piece you are working on in Photoshop? Have a general question about the product? Post it up here and for others to read and help.
The Ultimate Resource Thread
This thread contains tons resources for Photoshop including brushes, fonts, tutorials and much much more.
Free Photoshop Work Thread
If there is something you want done and you don't want to go out and hire a graphic designer to do so, post here. If someone feels like it, they will do the work for you.