Good expense tracker for taxes?

Having done nothing special with this years taxes, I vow to track my expenses this new year. I'm an independent contractor in IT to a Fortune 50. Books for study, transit, etc; I think I can make a dent in next years tax return. Photo receipts, email receipts from online, anything else that might pop up.

I remember hearing Josh Tops go on about a new app the Verge crew used to track expenses that was good. Anyone recall? I'd like something that can backup to DropBox or similar.

I'm on Android. Thanks. (if there is a better forum lemme know) Computer only solutions are ok too if there good. Chrome apps?