Sure looks like it is their driver, not DisplayLink at fault. As others have confirmed, there is no compatibility issue with the DL drivers and 10.6.6.
Kernel Extensions in backtrace (with dependencies):
com.wisair.driver.HWA(0.33.0)@0x494d3000->0x49537fff
dependency: com.apple.iokit.IOUSBFamily(4.1.7)@0x34715000
dependency: com.wisair.driver.CommonWUSB(0.33.0)@0x351ab000
com.apple.iokit.IOUSBFamily(4.1.7)@0x34715000->0x34748fff
dependency: com.apple.iokit.IOPCIFamily(2.6)@0x2ea16000
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