Hi there daniel. You might be interested in checking out [url="http://www.andyart.com/]http://www.andyart.com/[/URL"] and www.designsbymark.com . They have a lot of great photoshop tutorials at those sites. If you can't find what you're looking for at those sites, send me an email because I've got a whole list of sites like them
It largely depends on which image editing program you prefer. Although basic similarities exist in all, there are specific helps and groups for each one. Personally I find I can do just about anything with Image Composer and GIF Animator. They're easier to use than other programs. My favorite tool currently is Image Dicer.