IT Architect rounds up the state of mesh networking: Six vendors are in the space, Andy Dornan writes: BelAir, Cisco, Firetide, Motorola (mesh division), Tropos, and Strix. He divides them into four categories: metro-area (Tropos and BelAir), indoor with newer outdoor options (Firetide and Strix), proprietary client (Motorola), and central management (Cisco).
Dornan also divides up the companies by how many radios they use. With one radio, such as in Tropos's nodes, the number of hops to backhaul is limited, but it does keep per-unit costs lower. More radios means fewer locations for backhaul, as with units offered by Strix or Motorola. (Motorola's Canopy division, of course, specializes in backhaul, and EarthLink's municipal network design will use clusters of Tropos nodes in mesh formation backhauled via Canopy transceivers to aggregate backhaul to central points.)
The lack of a standard means no interoperability, but 802.11s is underway at the IEEE and may result in indoor interoperability. It's possible 802.11s will help just at the CPE (customer premises equipment) level rather than intranodally, too.