I honestly don't know. That's why the question :-) Is CC0 good for software? It seems to be a bit more complete from a non-US view point, but I don't know if there are lurking situations. Possibly MIT is better -- it's pretty darn permissive. I'm really just soliciting opinions.
Yes, CC0 is the only Creative Commons License suitable for software. It's endorsed by the Free Software Foundation [1], although not the Open Source Initiative. I use it for everything that I don't want to copyleft.