We have been working for some time on a new homes-for-sale search system that would be better than almost anything else out there - very easy to use and helpful for both relocation buyers and local people thinking about a move - or just watching their neighborhood.
So here it is: Greater Seattle Home Search. Starting off with a fun little article on the evolution of housing in the Greater Seattle and Eastside areas - walking through the years looking at what styles they were building and where they were building them - and the implications for potential buyers thinking about different areas and what kind of house they want.
There are a lot of pre-defined searches in there, like $Million+ Homes For Sale on the Eastside, and easy map searches for you to zoom in on a particular neighborhood and price range, or zoom out to a bigger area and get current market statistics. The x-geologist in me likes the terrain display option on the map :-)
If you have friends who are thinking about relocating to the Seattle area, perhaps as part of a job relocation, you might send them this link. And if you'd like to watch your own neighborhood, just set up a saved search and it will post you on whenever something new comes on the market.