A shopping cart that claims to be open source, but which offers fully set-up stores in exchange for a monthly payment. Some nice features but the cost could be a bit pricey for a new start-up. www.dotshoppingcart.com

The Flash demo looks interesting but I wasn't able to find a live demo store to see what it's really like.

It should also be noted that it's an ASP.NET cart so you're going to need to use .NET hosting and the hosting they offer is on US servers which is fine for targeting the US market but it won't do you any favours if your target market is elsewhere.

__________________
Lawrence