Often described as free time by experienced triathletes, faster transitions are something few triathletes practice. While few will zip to and from their bike as fast as the pros, if you are focused and organized, you will see a noticeable drop in your transition times by keeping a few things in mind.
As you are packing your bag the night before, keep your checklist handy so that nothing important is forgotten. It pays to go over this twice, especially if you are doing a longer distance race. When you go to set up in the morning, keep your space small and tidy. There is no need for a full beach towel and a bucket. Lay out a hand towel with running shoes and cycling shoes, if you do not clip them on your pedals. If you wear socks, have them in your shoes. Keep your race belt and hat/visor wedged in between your shoes. Aside from sunscreen, gels, and a face towel, there is not much else you should need.
Just As you approach transition finishing the swim and bike, think about what you need to do. Don't wait until you get to your transition spot. I like to mark my spot with a small flag, tape, or chalk to make finding it as easy as possible during a frenzied time. While not for everyone, if you are able clip your shoes on your bike for a faster mount, and then slip out after the ride, you will again be able to save time. Running with bike shoes on in transition is often clumsy.
Finally, make sure you practice transitions during brick workouts. This will reduce stress on race day as it becomes second nature.