We recently launched a new Drupal - Ubercart site for Fleurville, a company that sells high-end products for parents. Some nice work went into the product attributes, try rolling over the different fabric swatches. Also, a new Ubercart Quickbooks Integration module was written for the project that takes the orders from Ubercart and pulls them into Quickbooks.

The key modules and contribs used are:

Ubercart!
Quickbooks API module (with an extensive patch (http://drupal.org/node/298079)
Ubercart Quickbooks Integration module (written for this project)
Flat rate & UPS shipping

Imagecache
CCK
Views
Panels
Thickbox
Plus many more...

Please test out the Ubercart Quickooks Integration module if you can and give us feedback, post bugs (and patches if possible) to the project issue queue on Drupal.org.

Thanks to the Ubercart developers and community for all the good work you do!