Few ways currently, and more to come in the next few months. Basically:

1. Sharing your listing on social networks (good, not great for driving traffic).

2. Ability to list on multiple marketplaces, so you don't NEED to sell it through SellSimple - you can still list it on ebay, craigslist, etsy, etc. If it sells on one of those marketplaces, we'll auto-delete your item from SellSimple and all the other marketplaces. You're also not charged any SellSimple fee if it sells somewhere else.

3. Retention features on iOS - can't compare to eBays network, but downloads are growing quickly and users are buying items.

This is more a long-term strategy help to help us overcome chicken - egg. If we can exist long enough for that to happen through a free posting tool - we'll be able to (eventually) have enough traffic on our own listings to generate a high sell-through rate.