As I've gotten older, I've found that I do a lot more bodyweight exercises. Lot's of pull ups, push ups, and lunges/squat activities.
I've noticed that I still get a great pump, plus I love the "natural" look of a more athletic body rather than that of a bulky body-builder.
I just ordered the Universal Strength Apparatus to increase the variety in my training. Here's a short video of what I'm talking about.