The Harvest, released October 2010, is still selling well.
Windows Phone 7 Top LIVE Titles (Full Versions purchased)
Microsoftâ€™s Major Nelson has started publishing the top-selling Xbox Live for Windows Phone 7 games for the week ending the 22 June 2011, and the list is predictably populated at the top end mostly by the Must Have games currently being promoted.
Of note however is that exclusives like The Harvest are still hanging on there, more than 6 months after its release, and we can see that having an exclusive Windows Phone 7 Xbox Live game can definitely be a money spinner.
See the full list which includes console games also at MajorNelson.com here.