The heat maps are great for looking at a lot of data. We have other ones where in a single picture a user can see what is going on with up to 1000 securities, shares, etc. They also allow for drill down and mouse-over info and clicking on any part of the map.

I have alway wondered if there were projects out there that could "map" mortgage backed securities (CMOs and ARMs) to a regional or "neighborhood" locality. I have entertained the prospect of localizing these "regions" where a high probability of "defaults" or "refinance" was possible and then finding principal-only (or POs) positions that could be bought up (for nickles on the dollar) just before a "crash"!.

Your project knocked the sleepers out of my eyes too! Great stuff!