[dbro]

caveat: I created a similar site called domainjig.com, so take these as friendly suggestions.

The expired domain search is cool, well done with this tool.

Make it faster. Right now, loading the page to search for availability is taking longer than 10 seconds. When searching using the different tools, the response comes back after a few seconds delay. If you're comfortable discussing it, what are the major components of the backend? Is your data stored in RAM? Can you make the availability check instant?

eg. the expired domain search for "rabbit" over the last 30 days took a few minutes to return 2 pages of results. maybe the traffic referred from this post on HN is finding some bottlenecks for you?

The name spinner came up with some interesting suggestions. I'd suggest removing or hiding some of the advanced options, in favor of simplifying the default interface.

Hope that helps.