WiMax is the new generation of Wireless Network standard with maximum distance of 50 Km and maximum speed of 70 Mbps.

WaveSat miniPCI WiMax modem is the first WiMax modem with official certificate from WiMax Forum.

Is there any plan/attempt by Linux developers to support WiMax?

From Unstrung.com:

The WiMAX Forum, a non-profit corporation formed to promote and certify compatibility and interoperability of broadband wireless products announced, at the WCA Symposium held in San Jose this week, the first fixed wireless broadband network products to achieve the designation of WiMAX Forum Certified. Montreal-based Wavesat is the first supplier worldwide to receive this highly sought certification for customer premise equipment (CPE) solution. Wavesat’s miniMAX CPE passed stringent and extensive tests, related to protocol conformance, radio conformance and interoperability testing in order to attain the WiMAX Forum Certification seal. The miniMAX CPE solution, part of the Evolutive WiMAX Series is available to OEM / ODM’s worldwide to accelerate the design of 3.5 GHz WiMAX certifiable customer premise equipment compliant to the IEEE 802.16-2004 standard and its Corrigendum.