IF you are looking at using one of these as a direct replacement for an IDE drive, they are not as fast as a HD drive to boot up as the max transfer rate for CF cards is approx 1.5mbits per second. They are getting faster though so who knows.
Where they are very helpful is say in a read only setup as you can just turn the PC off (no need for timer shutdown after ignition off) and not worry about disk crashes
If you are intreasted in running a CF card for ur OS you will have lots of problems running desktop OS's it. I tried most os installs on a cf card (Windows 95,98,me, 2000 and XP) All come back with one problem or another when being run for long periods of time.. Most of which are blue screens. The best OS's to run on CF cards are small kernal OS's like embedded OS or linux (and or any hybrid unix os with a Lite kernal install). Currently I use Windows XP Embedded on my CF card.. I get 10 sec boot times out of hybernation or 30 sec on a full boot. I am working and getting the boot time faster. I want the hybernation under 5 secs. I am also looking at win ce.. The only problem is driver support. Windows XPe has all the normal support for drivers that full XP has...
--- XMP Project ---
Intraplex Latte P4 - Mini PC
ICOM PCR100 - AM/FM
Sony Ext DVD
Xenarc - 700TS
WinTV FM USB Adapter
Pioneer IR Steering Wheel Rmote
CoPilot 2003, ShowShifter Pro, Dragon VR, Communicate.