I am impressed by Scream's response...
Most of my clients are Professionals in some sphere or another, but are mostly NOT web savvy. They go by what they SEE, ease of use, does it do the job, and what does it cost. That's all they're really interested in.
Viewer selectable style sheets are a GREAT idea. How about establishing a Library of styles for people to d/l?
Perhaps the same with the front end?
Thanks for your prompt, and positive response.
