I second Tim. We offer two types of updates via email for our clients.
One is a specific search for area, price range, minimum number of bedrooms/bathrooms, etc. Whenever a new home is listed in the MLS, you'll be the first to know.
The second is a ListingBook account. This is a paid service that we offer to our clients for free. We set up an account for you with your basic search parameters. The difference is that in LB, you can change your parameters. You can add locations, change your price range, etc. You have more control over what you are searching for via our MLS. You get daily emails of new properties, price reductions, etc.
We would be happy to set up either for you. For more information about our services, you can visit our site at www.StoneWoodTeam.com. We are the #1 agents in our Old Town, Alexandria Keller William's Office and serve the DC Metro area as we are licensed in VA, MD and DC.