Abandonia Reloaded - A bunch of some assorted roguelike reviews, pretty in-depth.
Cymon's Games - Reviews of the 2009 7DRLs
Kostatus' reviews - Reviews of some of the current projects.
Paul K. Pekkarinen's reviews - Reviews of more current projects. Mostly late 2004. [Link Defunct - Sept 2008]
Roguelike Review - Outdated, yet some nice reviews for older (classic) games like Omega, Moria, Larn and Hack.
Temple of the Roguelike Reviews - Reviews of new roguelikes, with screenshots and details.
Underdogs Roguelike Reviews - Reviews of old and new roguelikes, with screenshots, details and user comments.