Epinions: Scuba Diving - Reviews on equipment and destinations written by consumers at Epinions.com.
HowStuffWorks: How SCUBA Works - Photographic tour of everything you need to know about SCUBA and dive equipment, and how your body reacts to the underwater environment.
Melinda's Corner Product Review - Some product reviews from a merchant sales site that do contain some useful consumer information, but be aware that these reviews are also promotional in nature.
The Rebreather Web Site - Dedicated to the dissemination of information regarding the art and science of diving rebreathers of all types.
Scuba Board - Articles and message boards about scuba diving, underwater photography and equipment.
Scuba Forum - Features discussions about dive safety, dive travel, scuba equipment and marine conservation.
Test Dive - Independent scuba equipment, dive sites and dive boat operator reviews. UK focus.
Undercurrent - Scuba divers' magazine. Online version has a few select articles, in "latest issues" and "back issues index", some of which cover equipment reviews.