Video talks on 16S data analysis posted.

URMAP ultra-fast read mapper posted (paper).

~20% of taxonomy annotations in SILVA and Greengenes are wrong (paper).

Taxonomy prediction is <50% accurate for 16S V4 sequences (paper).

97% OTU threshold is wrong for species, should be 99% for full-length 16S, 100% V4 (paper).

Provisional and fixed builds

See also
Known bugs and fixes

Provisional versions
If I send you a link to a version that is newer than the latest version posted on the download request page, then it is considered provisional. This is because it has not undergone full regression testing. It should therefore be considered alpha or beta software, and is generally not recommended for production use unless you need a specific fix.

Fixed versions usually don't exist as builds
This may sound strange, but there is a rational explanation. The version number includes the source code revision number. For example, in 6.0.123, the major version is 6, the minor version is 0 and the source code revision is 123.