YAK version 1.6 has just been released. There are mainly minor changes (a custom out-of-stock message, removing the link back to the project page, and minor restructure), apart from one fairly major enhancement — to support WordPress MU.

At the moment, I’d say this feature is “beta” quality. The full YAK test suite runs without problem, but I haven’t really spent a huge amount of time checking that there are no issues between multiple blogs. More testing is definitely recommended for anyone who decides to enable this on an MU install…