I use CF for my m0n0wall, and have in the past used it for other
things. It's not really noticeably faster, but it's nice that read is
free pretty much forever instead of wearing out. So if you aren't
writing anything it's pretty rock solid.
CF is nice because you can put it into IDE mode, and it *just works*
so those IDE<->CF boards should be really cheap. The company I work
for makes them for several products, and we had some rejects which is
where I got the few that I have.
Dan