I would imagine most of the links I have are ones that are popular anyway.
However I will recommend GIMP for anyone who wants to have a go at artwork, as this is a great MANIPULATION PROGRAMME. It is (apparently) very similar to Photoshop, but totally free. It is the one I use, and have done most of my icons on it. So, if you are thinking of having a go, or upgrading from a basic photo programme, this is the one for you.
A great CLIP ART programme that I use is Clickr ... another free resourse.
This was originally post on Dreamwidth