Hatch Magazine has a nice little article on allowing the nymph to swing at the end of a drift before picking it up for a re-cast. It is a tactic I have used for many years and have had great success with it.
“…The beginner nymph fisherman dutifully focuses on drag, drifting the fly through the water as long as he or she can prevent drag from setting in by mending the line, following the fly with the rod tip and so on. Once that battle is lost, and the fly starts to drag, most anglers will immediately lift the rod and recast. Instead, try this: once drag sets in, let the fly continue to drift downstream while stopping the line, allowing it to come tight. The nymph will swing around…”
Last second thought: Using nymphs with soft hackles (flymphs) or rubber legs makes this technique even more successful.