- WTV (new Windows Media based format for PVR based recordings)
- AAC-LC (regular AAC)
You can get all these codecs and more with the K-Lite Codec Pack, however, this is the 32-bit version. The 64-bit version of K-Lite doesn't offer many codecs at all.
Now, if Microsoft can just add support for the Matroska file format, we'll be all set.