These are some of our favorite tools to search for homes:
 

MLSListings is the actual Multiple Listing Service (MLS) from which Redfin, Trulia, etc. pull.  We've noticed that often the secondary sites show homes as active that we know are sold, and also sometimes there is a lag picking up newer listings. For that reason we recommend going directly to the local MLS.  It's free and pretty easy to use. 

Alain Pinel has a nice open house website to help you find open houses for the coming weekend.  If you check it on a Sunday night or a Monday morning it will not show any results because agents have not yet posted for the following weekend.  To search the Mountain View homes for sale, or any of the surrounding areas click here.

For researching Mountain View schools we like these sites:

School Performance Maps

Mountain View school boundary map and street directory (a must-have for school info)

Greatschools.net