I have heard a lot of "buzz" about Ethereum, but apparently its 1.0 version won't be released for a while yet.
I have heard a lot of talk about "smart contracts" from people who admire Szabo, but I haven't seen many implementations.
I notice that Ripple lists "contracts" under "future" features, which seems to imply that they are not ready for use yet.
The one implementation I have seen is at :
Are there any other, more popular ways to implement "smart contracts" that are already in use?