AVR Butterfly and external storage

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Just to confirm - is there a preferred way to use external storage with the AVR Butterfly? 512k flash is not enough, but otherwise the device meets my requirements.

Having searched the internet and these forums, it seems that the best approach is to use the 4 JTAG pins with an MMC card - both of these being documented techniques.

I would prefer to use CF (because I have some stock) - is there an IC that can allow me to interface serially to the CF ? (otherwise, there don't seem to enough pins on the AVR Butterfly left for native access).

I don't plan to use a file system: I will be writing to the blocks directly, and then later extracting the raw blocks under BSD.

Thanks for any feedback.