I cannot comment directly on the use of SD->CF adapters in Jornada's since I don't have access to a Jornada, but I can talk about what I have done with my MobilePro's.
I have put a miniSD card into a mSD->SD adapter, that into a SD->CF adapter, that into a CF->PC adapter, and the whole assemblage into the PCcard slot and had no problems.
I would also note that my PNY SD->CF adapter
(with the SD card in
) is the same size as a standard CF I card, so I would think it would work in a Jornada.
(Note: I was not able to find a current source for the PNY adapter -- Amazon is out of stock -- but it looks like this would work [http://cgi.ebay.com/CF-Compact-Flash-Adapter-4-SD-MMC-Digital-Memory-Card-D_W0QQitemZ6795504295QQcategoryZ42191QQssPageNameZWDVWQQrdZ1QQcmdZViewItem]
).
Hope this helps.
Bruce
MP890 Evangelist