We're getting close to Mac OS 10.6 release time, I can feel it. MacNN is reporting that Apple has issued a code freeze on Snow Leopard APIs. What that means is developers who are using the current build, number 10A354, are able to write code assuming all major components of the OS are in place. Minor changes in this build include Chinese handwriting recognition for multi-touch trackpads.
For now, your guess is as good as ours as to when Snow Leopard will be released. In the meantime, you can browse Apple's Snow Leopard web pages (which went up in June of '08 believe it or not) or catch up on other rumors.