Arcteryx makes a rigger's belt that is really making an impression. Under development for a couple of years now, everyone whom I've talked to so far loves it. The feedback I've gotten (admittedly just from a couple of people) are that it's comfortable, handles weight well and has some truly innovative design traits. Here's one of the gentleman from Uber Group explaining it at the ADS Inc. Warrior South. ;
You might also be interested in this review from Kyle Defoor for more details.