.CO domains are new premium domain on market now
Here is some Recent .CO domains sales report

auctions.co $ 4,905 2011-02-21 sedo.com
download.co $ 50,000 2011-03-01 sedo.com
sexvideo.co $ 13,068 2011-03-12 sedo.com

And you ? Do you know some sales ?
Let's forum member see that
Regards