"'Early research' says 93 percent of WP7 customers are 'satisfied' and 90 percent would recommend the platform to others. We don't know details about the research, though -- number of customers polled, time frame, so on.
Average of 100 new apps in the Marketplace per day, and over 6,500 total are available right now.
Most importantly, "over 2 million" licenses have been sold to OEMs around the world."