Maybe it's time for someone to write a DDK emulation layer? Should be able to yank out most of it from the ReactOS project.
Not perfect, but at least the binary drivers from windoze could be use as a last resort.
That's increasingly not the case. openbsd has the blowfish, netbsd the stupid flag and freebsd the devil.
When the occasional BSD lurker sees a devil, he thinks FreeBSD.
Have the text/image animated, each frame by itself doesn't contain all the information needed to decipher the text/image.
Interlaced CAPTCHA's is the thing!