http://www.psism.com/adcf.htm#2-slot

Here is a different adapter. 2 slots per card. So you get the keep the space of one drive for something else. Unit is 1cm thk but has the 44pin socket pointing up. That seems an advantage. Price $45. About 50% more expensive than the others at $16 ea.

Quote:
Features:
- RoHS 2.5” form factor CF to IDE interface
- 2 slots, supporting Type I/II CF Card and Microdrive
- Male 44-pin and/or 40-pin IDE connector. May require a 40 or 44-pin cable, (not included).
- Power Voltage 5V. 40-pin version with 4-pin power connector on-board
- LED indicator
- Dimension: 75mm x 70mm (2.95" x 2.76") x10mm
- G. W. : 60g ( 2.12 oz)
- Due to IDE restrictions, the CF card is not hot-swappable.
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Glenn