The "sifter" widget displays expert reviews from Magnus Manske's experimental toolserver database containing such reviews (they are currently being regularly pulled from the Encyclopedia of Life (Atom feed), Rfam, and Pfam) and displays them in a "Reviews" tab where available.
Known issues:
You can use this script together with sifterbooks, which generates metadata for use with the book tool to export a selection of reviewed content.
Please see Expert review on Meta for centralized discussion regarding this functionality.