running executable on wakeup, login, startup etc...

Over the past couple days, I made a system that takes a picture using my macbook pro's camera, and then sends it to my home server. Now that i have this cool little program, it would be cool to run it when the macbook comes out of sleep and starts up. Right now I'm using crontab to run the program every hour, but i was wondering if there was another way to do it under the above cases.