I have been working with the folks over at BestHomePro.com. They have put together an excellent search solution. Their latest revision includes Microsoft Visual Earth maps – gorgeous maps which are easy to navigate, scroll, zoom in/out, etc.
The search tool provides an intelligent system which provides a Top 10 list based on parameters you set. Any time another home pops up that is better then a home on the top 10, it updates the list (in priority order!) and notifies you. Brilliant!
Give it a whirl!