It should be a good free option to DNxHD, Cineform etc. as a near-lossless intraframe codec.

Limitations: Windows 7 is required and also registration on the GV site.

Here the download page:

http://www.grassvalley.com/support/downloads/products?product=&download=625

Here some discussion on the topic:

http://www.sonycreativesoftware.com/forums/ShowMessage.asp?ForumID=4&MessageID=818496

Free codec release came with the new Edius 6.5 release:

http://www.streamingmedia.com/Producer/Articles/News/Featured-News/Grass-Valley-EDIUS-6.5-Now-Shipping-83580.aspx

EDIUS Pro 6.5 include:

Color correction tool supports 10-bit color depth
Export sequence with alpha channel
Native RED (.R3D) support*
Improved XDCAM/ P2 data transfer
3D (stereoscopic) editing
AVCHD 2.0 support
EOS movie support (ALL-I (I-only), IPB)
Camera RAW format support*
Filmstrip view in Timeline
Enhanced video layouter (drop shadow, resize quality)
Built-in loudness meter
Built-in shake stabilizer
720p Blu-ray authoring support
Flash F4V export
QuickTime HQ/HQX codec (Windows/Mac)