One example in the NetBSD tree is b*() vs. mem*() -- mem*() are the
   POSIX interfaces, and are the 'right' things to use in user-land code,
   but the b*() interfaces are what have been used in the kernel forever
   and, last i heard, there was no great desire to change that.

Actually, that's not true.  This has been on my List for a long time,
and I've certainly mentioned it before.  However, with all the other
kernel changes going on right now, this is not a good time to do it.