Some CF cards do, some don't.
Check this thread for more info:http://forums.neurostechnology.com/smf/index.php?topic=7165.0
Also do a search on "compact flash" in the search bar up top. You'll find some more info about CF cards.
I have a 4GB CF card in my Neuros... it works; records & plays back fine, but it is incredibly slow to transfer files. I'm not sure if that's more my CF card (generic brand my dad bought off of eBay) or if it's the Neuros.