Over the past year or so I have built a few real estate lot management tools using flash. Here is a list of them.

Hawks Landing : This is perhaps the most in depth lot manager I have made. It is managed through doItLive, an ASP based content management system that allows the client to update all textual details on the map, and most importantly the status for when lots are available, sold, on hold or available through a builder.
Copperfield : This one is a far simpler approach than Hawks Landing but still is effective in displaying necessary details to potential home buyers and developers. It has an overall view of the map with options to move in closer to each phase. This map is also managed through doItLive.
Heritage Hills : Heritage Hills also has an overall view with the ability to move into one of the phases for lot details. It was also built so that it is easy to add detail maps for additional phases as they come available. This particular map is managed via I macro I wrote that exports an XML file from a Microsoft Excel spreadsheet containing all of the lot details. This particular manager also has the ability to highlight lots based on builder.
Forest Crowne (Phase 3 & Phase 5) : The Forest Crowne lot maps are very simple, showing just enough detail to keep potential buyers in the loop about which lots are sold or on hold, as well as showing the general dimensions and shape of the lot. This map is also updated through the ASP CMS doItLive.