The number one transferable skills that you, as a desktop publisher bring to the table is your strong eye for layout. While it is time that there are only a few rules that will hold true for every site, you will find many sites similar to print publications. Some sites will have layouts similar to flyers, while others will be like newsletters. Your professional judgment and experience with layouts will give you get a leg up in web design.
You can also make good use of your strong sense of color and shape. If you have to design a sites color scheme, or even a basic logo for the site you will be in the clear. Think about it. You already know how to create the needed graphic elements and match them well.