The current Maven 3 documentation is on the Maven main site . However, it is still being updated, and I'm sure you will like any inconsistency you find. Due to the fact that Maven 3 is backward compatible, most of the documentation remains valid. Compatibility notes do a good job highlighting the differences.
If you are already using Maven 2 and are looking for reasons to upgrade, see the stack overflow question about whether Maven 3 is worth it .
Also, note that due to the nature of the beta / alpha / release candidates, the documentation should not change much between versions, so all blog posts on the pre-release Maven 3s should be pretty much correct.
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