I use several tools that help me be more productive (In fact, I have an entire resource on how to be a productive leader).
Here's 3 of them:
#1 – Omnifocus – this is way more than a program for adding "to do" list items. This was build around David Allen's "Getting Things Done" System. I have it on my Mac, my iPhone and iPad. They all sync, so I always know what I need to get done no matter where I am. Our whole office is on Omnifocus.
#2 – Text Expander – This program allows you to create shortcuts so you don't have to type the same thing over and over again. I have a shortcut for our church's address, my email salutation and title, and info that I type every week. This saves me hours every month. In fact, Text Expander will keep track of how much time it has saved you. The cool thing is, you can download a free trial here.
#3 – Dropbox – This is the best way to share large files. You should get an account. You'll use it more than you realize.
There's more stuff I use, but these are the tools that I get the most mileage out of.