You remember Homestore, right? "Leverage the Power of the Red Spinning House."
Over the last five years or so, 360-degree panoramic virtual tours have slowly decreased in popularity. This has happened for various reasons, but the one that sticks out to me the most is the increasing popularity of mobile Web browsing, and the lack of support by mobile platforms for Flash. Yes, you can thank Steve Jobs for that one.
Based on a study by StatCounter, as of November 2010, mobile Web browsing makes up for approximately 4.02 percent of the total Internet traffic.