Recommended CF cards:
SanDisk Extreme III - 8GB/16GB
Afaya industrial grade CF card - 8GB/16GB/32GB

Certified CF cards:
Afaya industrial grade CF card - 8GB/16GB/32GB
SanDisk Extreme III - 8GB/16GB
Transcend 300X - 4GB
Transcend 400X - 8GB/16GB

Note:
Selection guide line for CF cards that are not on the list:
1. Must supports UDMA
2. Must supports >20MB/s read/write