Graphing Search Result Numbers Over Time

So I have had a random idea for a little project that could be fun. We all know about Google Trends, eBay Pulse, the Overture Search Suggestion tool. Now I think all of these are truly amazing tools. Something we don't neccessarily know about is the supply side of this equation. All of a sudden that is really interesting me. It would be relatively simple to set up a CRON job that runs once daily and pulls the abundance through the various API's available. It could also be really fun to see how trends shift over time (perhaps looping in Technorati and a couple of other sources). It could even be a fun tool for an eBay seller to help me monetize it a little bit... hmm I think I may build this at the weekend and if I do I will post the resulting graphs on this blog as well as on a little site I recently purchased with 1 and 1. YAY!