The app is comicswap.com
a handful of the new features (from the "launch" email):
* Dedicated Comic Pages with Multiple Listings (no more 1 listing, 1 page setup)
* Wantlist - Add a comic to your wantlist and get an instant notification when someone lists it for sale or trade!
* Over 180,000 Unique Comics Available to Browse on the Site
* Many Comics Have eBay and other retailers Piped In along with Users Listings for Comparison Shopping
* Robust Feedback System (on swaps too!)
* New Messaging & Transaction System Allows for External Swaps (you dont even have buy/sell/trade through our site to be able to track and leave feedback on your swaps!)
* Mobile Design - works on phones, tablets... pretty much anything except stone slates from the prehistoric age.
* For dealers and those with lots of comics to sell -- you can subscribe to a feed of items that receive more than 5+ wants from users and receive an additional bounty for listing these items for a quick sale.