I just sold StudyOrigami.com for $150. I had this site for about 10 months. When I sold it, it was pr3, alexa 2.2mil, and got about 100 hits per day. I really liked this site, but I prefer to have extra money. It had about 350 pages index in google, and over 100 different origami video instructions.

Heres the link to the sales thread at DigitalPoint:

[WTS] The BEST Origami Blog On The Internet! 1st page google for multiple keywords!