Heres a mod we used at
www.orangeaday.com.sg:
http://www.bcsengineering.com/store/product.php?productid=290&cat=0&page=1
However i am just reporting to them that the filter button, when viewed in IE will be out of alignment. These is not seen in firefox.
A problem i am encountering too is that to edit a group of products, like in normal xcart, it will apply the values to all products, which sometimes is not the case.
I am searching around for solutions.
Just to let u know more so you can decide. =)