Uh, I hate to tell you, but they're just bog-standard wince PXA PDAs - none of them are Linux devices and there's nothing special about it being an Intel chip - it's just ARM.
I've been active (although I'm now largely retired) in the handheld-Linux community for something like 5 years now, and I have to tell you, if the device doesn't come with Linux, it's probably a dead-end, and if there's no support from the vendor, it's almost certainly a dead-end. Hence the original question being about Linux PDAs - not wince PDAs which you can hack a cut-down, unstable, unsupported Linux onto.
Oh, and I don't know where on earth you got that that card is the first SDIO Wifi card - they've been out for at least a year or two now, hell, Palm even sell one themselves, although they've refused to provide a driver to use it on the Treo... It's possible that it's the first 802.11g card, I guess.
(Sorry - this came out harsh, not sure why)