I just noticed that Adobe Photoshop Lightroom 3 is currently available at Amazon for $149. Apparently this is a special deal through November 12 (Sat). If you've been thinking about picking up Lightroom this would be a good time.
For real estate photography you can do almost everything you need to do in Lightroom. Some do everything including cloning and window masking in Lightroom 3 but I'm still old fashion and take a trip out to Photoshop for cloning and window masking.