Images with WebguiImages are a great way of communicating information. Webgui makes it easy to add images to a webpage, or to make image galleries.
Check the resources on the right for tutorials & software
Teach-nology - list of links
Open Directory listing for web graphics tutorials - from DMOZ Open Directory
Irfanview - description from the Irfanview site:
"IrfanView is a very fast, small, compact and innovative FREEWARE (for non-commercial use) graphic viewer for Windows 9x/ME/NT/2000/XP/2003.
It is trying to be simple for beginners and powerful for professionals."
GIMP - Gnu Image Manipulation Program
- "a freely distributed piece of software suitable for such tasks as photo retouching, image composition and image authoring."