I love E-track:
http://www.uscargocontrol.com/Van-Trailer-Products/E-Track-Straps-Tie-Downs
I ran two strips of it down each side of the utility bed on my work truck. It is wonderfully versatile. There are a number of different attachments available, and if you get creative you can do all sorts of things with it.
I even made my own ladder hooks that mounted to the E-track:
A pickup bed is not going to lend itself to long strips of E-track, but you can use short sections, or even just single mounts. I have a utility trailer set up with single mounts, and they are positioned such that I can put a series of 2x6s into brackets and create a flat surface on the top of the trailer--particularly useful for transporting things like shower surrounds.
Just an option to be aware of.