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There's also this very promising thread that links to a product which says they offer source code so you can compile the drivers on Linux. But the thread also says its expensive. I didn't see prices on their web page so I don't know if it's changed.

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Yeah, I just pseudo-registered....$400 and up....Not going to happen.

It occurs to me that we probably don't need the full-on industrial solutions that support hardware flow control. I'm guessing that just about anything we'd want to connect to our empegs would only require 3 wires - TxD, RxD and Gnd. (GPS, laptop, handheld, OBD etc..)

Could we do something fairly simple with a couple of UARTs, a MAX238 and a PIC ?