Firesign Branding http://www.firesignbranding.com/ is an expiring domain search engine that allows users to search and register expiring and dropping domains. Users can search by keyword and find exact match or partial match domains.
We currently aggregate, structure and index expiring domains from Domainmonster, GoDaddy, Namejet, Pool, and Snapnames. Some domains are available from sources, and users can compare prices for the domain.
This site has been under development for over 18 months and we just launched it. It is running in demo mode and we have yet to publicly release many upcoming features. The core functionality is extremely stable, and the site is generating revenue.
I'm currently working on premium accounts, bookmarks and alerts for the domain search engine.
We will also be introducing a few free & premium SEO tools as soon as we receive some funding for the required hardware.