I'm running the Linux Dev Channel Chrome release. Just had a look through the about:Flags page and found an option for Cloud Print.

I shouldn't be this excited about being able to print email from my phone :P (considering I never do it)

Also they seem to have added Printer sharing with other Google Accounts. I've shared my printer with a couple of family accounts, but haven't had a chance to print from them yet.

that option is also available in chrome 11, not sure about 10