[liranz]

It's a funny thing http://schema.org/ syntax is not there anywhere. I think sites based on dynamic UGC content (especially media oriented) should seriously consider adding semantic markups.

Since adding them our Google webmaster's tool is much "happier".

[opendomain]

Wow! It is great to see Schema.Org mentioned on hacker news! I gave this domain to Google as part of my open source project http://www.OpenDomain.Org - they still have not given me accrediation, but it nice to see it is being used to support Open Source

[joeblau]

Did some digging and found them on Schema.org. Here are some of the creative work schemas: http://schema.org/CreativeWork.

[criswell]

They use it in the Google+ section under "Important Metadata". It drives me nuts that Twitter, Facebook, Google+ and whoever else all don't use one thing.