Abandonia Reloaded - A bunch of some assorted roguelike reviews, pretty in-depth.
Kostatus' reviews - Reviews of some of the current projects.
Paul K. Pekkarinen's reviews - reviews of more current projects. Mostly late 2004.
Roguelike Review - outdated, yet some nice reviews for older (classic) games like Omega, Moria, Larn and Hack.
Slash's Roguelike Reviews - Reviews of new roguelikes, with screenshots and details.