Once you leave the world of cellphones there's a lot of compact flash being used? Uh where? Only older SLR cameras nowadays. Quite frankly its a pretty dead format other than that. My Wii has a memory slot... SD. My brother's laptop's memory slot? SD. Digital picture frames? TomTom Navigators? Sansa MP3 players? All SD.

You'd be hard pressed to find anything else recent that uses CompactFlash.