Dowels are a great way to reinforce right angle joints when making a door or frame, or edge joints when making a glued-up panel. And the secret to accurate dowel joints is using a doweling jig like this one from Task to drill the holes for the dowels. It guides your drill bit and positions the holes exactly where you want them. See how easy it is to use.
Task Self-Centering Doweling Jig
Replacement Guide Bushings