I bought my jointer to enable me to use rough lumber when I built the crib for my Grand children almost six years ago.
Popular Woodworking Magazine just ran a short essay on the jointer which reflects much of my thinking, it is nice to have your ideas supported.
The on-line course that is being offered by Popular Woodworking Magazine is an interesting concept and one that I may explore one day. At this time I have lots of woodworking books and magazines filled with good information and haven't felt the need to add on-line education, but I am sure there are younger woodworkers that are totally comfortable with the idea.
I would agree with the essay buy a jointer first, then buy a planner. It is really nice to have both.