cc0
As noted on the Creative Commons blog, the folks at Digg have converted to CC0 (replacing a multiyear use of a different public domain legal tool).
This is very cool on lots of levels. But Daniel Burka of Digg said it best, so I'll make this a short post by simply quoting him...
This is good for the internet and good for society.
He's talking about the public domain, and he's right.