re: Poker & Pot Limit Omaha Strategy
If your looking for some basics like hand selection Jeff Hawg's book on PLO, he has some more advanced ones as well which I havn't picked up yet but his older one has a main focus on hand selection and positions for such hands.
In general though you want the four cards to be able to work together, which is why wraps are so strong like 789T, even gaps in the wraps could make it a hand to provide more outs depending on the flop like 569T if a 78 shows up on the flop but you want the gap to be closer to the bottom of the wrap than the top for better drawing to the nuts without being 2nd best....so 589T over 567T just based on gap.
I'm sure there are lots of other resources around as avicktor has pointed out one.
Just remember its a drawing game so make sure your drawing to the nut hands and not the 2nd nut's and if you don't have nuts its pretty probable someone else does especially when your talking the lower stakes where its mainly going to be 1st level thinking