ksh(1) is new, as advertised as a 10.4 "feature" on Apple's web site. Here's a nickel, granddad; go rewrite your old scripts.
launchctl(1) is the user interface to launchd(8).
link(1) and unlink(1) are simplified versions of ln(1) and rm(1), from the Single Unix Specification version 2.
wait4path(1) waits for a "given path to show up in the namespace".
zsh-4.1.1 has been replaced by zsh-4.2.3.