Don't forget that the mini pcie slot defines both USB and PCIe signals. Some cards only use USB, others PCIe, so if your new gizmo doesn't show up in lspci, try lsusb instead.
I think someone said the 3G in the Kindle 3 is a USB device. It wouldn't surprise me if those were the only signals active on the connector. I'd have to look at the i.MX535 datasheet again, but it may not even feature a PCI bus. In which case, if your shiny new WiFi card *does* have a PCIe interface, you're out of luck.
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