I got a new interesting I phone app, barzloaded. You dial in the pounds and it tells you in a picture plates needed on the bar. Example, 655 is 3 hundreds on a side with the bar and collars. It was app 99 cents. Useful for meets.
We just use 45s in my office, but it's great to double check the bar weight at a meet.
I use gymbuddy (iphone app) and I love it. You program your routine into it and can add or create exercises and super sets. During your workout you can reference your last workout or the last 5 workouts. It has a timer for 60,120,180 seconds.
Graphs your progress, calculates 1rm based on each set, has an interval timer. It was the best $3.99 I ever spent for the gym, I don't think I would have made the same gains without being able to easily track my progress.