I also agree, great advice. I been taught that you
need to remove the crown from boards prior to getting
a good straight edge.
Dave: place the board, edge up on your joiner. See
if it rocks, if so, you have a crown in the board, you
got to remove it. The suggestion is to drop the crown
part on the joiner, carefully!!!, and take a small pass
until it stops rocking, then take a final pass. I think
a good handplane would also help this and perhaps might
be safer, tho, I've done the joiner procedure and still
have all ten digits.
Also, Dave, check the face of your boards. Make sure
you've don't have any warp or cup in them. Again,
place the board on your joiner, face side down, and
check to see if it rocks by pressing the back. If it
does, you got to lift the back up, slightly, to take
the cup out. I've used slivers as shims in the back
to lift the back, so that the leading front edge
is flat to the table.
I'm sure there's some book somewhere that tells you
all this, but I learned in a woodworking class
taught by an excellant instructor.
What area of the country are you in?