The popularity of ONA (Original Net Animation) has been picking up recently, and last week NamcoBandai published Kyousogiga, an episode-length video to its NicoNico and YouTube pages. Kyousogiga was created by Izumi Todo, who also made the Ojamojo Doremi and Futari wa Pretty Cure series, and animated by Banpresto and Toei Animation.
The animation style is fairly stylized, and it reminds me of the stuff Madhouse makes. The video description mentions a new work coming out in March 2012, but it doesn't say if it's related to this ONA or not. Also, the video will only be available until January 15, 2012, so watch it while you can! It's embedded after the break.
Kyousogiga homepage: http://www.kyousogiga.com/