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Kostatus' reviews - Somewhat outdated reviews of some of the roguelike projects.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Roguelike Review - Outdated, yet some nice reviews for older (classic) games like Omega, Moria, Larn and Hack.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