Forms Documentation:

Forms training using the Universal Editor (PDF file)

Forms demo (video, 20 MB) - Clicking on the link will open iTunes software. The video is 15 minutes long.
If you don't have iTunes, download it here.

For those Web publishers comfortable writing code for their forms by hand, there is additional information about creating forms using HTML code (.doc 24k). All web publishers creating forms should take a look at the guidelines for accessible forms (.doc 100k). See also Very Basic HTML.