Unfortunatly by default Yahoo stores tend to look alike. You get the left nav buttons and a pretty basic look. You get to use templates (which basically involves programming in lisp (but point and click (without the brackets))). A couple of examples:
in reply to Re: Re: Re: interchange for e-commerce?
in thread interchange for e-commerce?
BargainCo - I just chose this at random from the list of sites, more or less a default
Alight - one I've worked on, uses templates and some tricks like HTML embedded in the templates. Uses other trickery like a perl script which takes the whole store and re-creates it with the 'trails' and paging which Yahoo doesn't support.
Barnes & Noble - the other end of the scale, uses something Yahoo calles RMI, basically involves downloading pages from bn.com and re-writing urls.
On the other hand, most stores don't want advanced features and for $50/month Yahoo provides a fantastic deal for small stores.
We use Intershop for sites that need features Yahoo can't provide. It's a great product but it is thousands of dollars just for the software before you start thinking about buying servers, hosting, development etc.