There are a few features that I believe would make marketpress the ultimate e-commerce plugin on the internet !
Please +1 or make new suggestions for the future of marketpress here !
1. Link Seller PayPal ID to User Profile ID - not Blog ID
2. One page checkout
3. A True Global Shopping Cart
4. Further advancement of Front end product entry
5. Native integration of grid layout
6. Geo-tagging products that are for sale
Feel free to add to the list and +1