1. parallel port CF card reader/writer
2. pcmcia flash memory (do they sell CF -> PCMCIA?)
This is a great, if not particularly cheap, way to get a lot of removable storage onto your CF-01. If you buy a CF card reader for your PC, a CF card, and a PCMCIA-CF adapter for your CF-01, your can use the CF card as a tiny removable "zip drive" for transfering files back and forth between PC and CF-01. Yes, there are cheaper removable drives, but I like this option because it takes up zero space; I just keep it in the spare PCMCIA slot of my CF-01 (with my wireless network card in the other slot).
You can get a CF-PCMCIA adapter here for $6 plus shipping. Better yet, get this . It's a very good USB card reader that also includes a CF-PCMCIA adapter, so it includes everything you need for both the PC and the CF-01 (besides the CF card itself).