They now have a version of the Recorder 2 which does use SD cards - the R2 Plus, costs $10 more than the basic R2.
CLARIFICATION: I bought the R2 Plus before they added the SD slot. Pity - I already had SD memory, changed over to CF to use the R2, would've been nice to keep using SD. No biggie, to me, though...
Still a great recorder. There's a guy on the forums who's tooling up to offer an in-car package pretty simple.
The R2 runs on 5VDC, so an adapter will be needed; not the cheapest, but straightforward, is a universal adapter from RadioShack. Then again, I do see they have an adapter for the 442 (older product) for $15... no definite indication that it is or isn't correct for the R2, would have to ask.