These are some of the features which I (of course many others) would like to see in ubercart.
1. Promo Code: Value reduction either by percentage or fixed amount. Types:
a). Duration limited promo code (1st Dec. 07 - 24th Dec. 07).
b). One time (say: x time) promo code.
2. Bulk Discount: Value reduction either by percentage or fixed amount. Types:
a). Discount when customer buys a single product in quantity.
b). Overall discount on total value.
3. Multiple Photos: Many times one single photo is not enough for a customer to purchase an item, so adding multiple (more than 1 in the same page) could help them to make the correct selection.