The Knowledge Base is kept up-to-date with the most common inquiries about Objectify.
There's also a support forum Your thoughts and feedback will shape the future of Objectify, so don't be shy. Even just knowing how you use it (or how you'd like to) is a big help in prioritizing upcoming features - and there are some hot ones on the docket!
News and updates are posted to Objectify's Twitter account. Questions and comments are welcome there too, of course.
The current release notes are available.