I stumbled upon it as a replacement for Smart Actions for Motorola phones, which I was using to auto respond to texts while driving, and automatically set my phone's profile for work, home and sleeping.
Tasker does so much more, I'll probably still be tweaking or adding tasks a year from now. If you haven't heard of it, go check it out. If you've used it, then I'd be interested to hear how you're automating your phone.