Video Optimization: Google Supports FB Share and RDFa
If you're creating videos, hosting them on your website, and aim to optimize those videos for competitive search engine placement you'll want to pay attention to this one.
Google today announced support for Facebook Share and Yahoo! SearchMonkey RDFa for videos.
These markup formats (micro-formats) allow you to specify information (like titles, descriptions and even preview images) about videos and potentially influence how they are indexed - although it's doubtful that videos utilizing this technique will be given preferential treatment. While Google does pretty well at discovering this information by itself as it stands today, using these format structures enables you to give them some help and guidance.
See the full story at: http://www.websitemagazine.com/content/blogs/posts/archive/2009/09/15/video-optimziation-google-supports-fb-share-and-rdfa.aspx