After registering with House Hunt, they provide you with a list of available properties in your area. However, to see the details beyond beds, baths, sq. feet and price of said online real estate you must again register and agree to allow local agents to contact you. The details will not be provided until an agent contacts you. This is a great resource as long as you don't mind agents emailing and calling you.
For a service that doesn't require personal information to get listing details see the #1 site, Realtor.com.