"This handy little online "Flash" presentation from K
Computing provides an extremely well presented, easy-to-follow,
step-by-step mini-tutorial on BusyBox-- the Swiss Army Knife of
Embedded Linux.
Topics included in the tutorial are . . .
BusyBox -- what is it?
BusyBox -- why?
BusyBox -- pros and cons
Making BusyBox (downloading, configuring, compiling,
linking)"