It doesn't matter if you do all the error checking in the world, or if you have the most beautiful graphics, if your site or application design isn't usable, it's not going to do well. Get input and advice on usability and user interface issues here.
I'm looking for design inspiration - I'd like for people to post some ecommerce sites (standards-compliant of course!) that they think are both good design as well as usable. Thanks!