You've got some great responses here! I switched to morning workouts about 8 months ago and i'm soooo glad I did!! Like other posters, I found myself often skipping evening workouts because of other commitments. I now get up around 5:15 and start my workout between 5:30 and 5:45 (depending on the length). I'm usually done and in the shower by 6:45 am and out the door by 7:30 am. Here are a few pieces of advice that helped me make the switch from evenings to mornings.
-- Have everything set out the night before (pre-workout snack, water glass, clothes, shoes, DVD, needed equipment). Some even sleep in their workout clothes (which is a great idea I may try soon). The more prepared your are, the easier it will be when you are walking around in a fog and the less chance you'll skip your workout.
-- Win the "internal sleep battle" - ya know, that battle that happens in your mind between getting up and sleeping a bit longer. I still fight this battle almost daily and that's okay. Once you say "NO, I'M GONNA DO THIS" a few times it gets easier.
-- Start slow. Expect the first week (or two) to be rough. I made my first week of morning workouts a "recovery week" and i'm so glad I did! All of the workouts were a little easier and shorter which gave my body time to adjust to the new time. It does get easier. I promise!
-- Find a pre-workout snack that works for you. Some workout on an empty stomach, some eat a small snack, and some drink a cup of coffee/glass of milk and eat a bowl of cereal/oatmeal. See what works for you. Everyone is different so what works for one person may not work for another. I found a 1/2 of a banana, a glass of water, and a 15 minute wait works best for me. I tried coffee, cereal, crackers, other fruits, milk, oatmeal, etc. before I found this "perfect" combination.
Best of luck!!
Katie