I’m a huge fan of Gina Trapani. She is the founding editor of one of my favorite blogs, Lifehacker, a co-host on one of my favorite podcasts This Week in Google and above all an amazing open source coder and advocate. She is also the the author of Upgrade Your Life: The Lifehacker Guide to Working Smarter, Faster, Better, a fantastic book about how to streamline and hack your life to become more efficient and get more done. (Affiliate Link)
Recently she developed her first Android app called Todo.Txt Touch. It is a mobile version of her famed Todo.Txt command line to do list program for the computer. Now this is definitely a geeky app but it’s potential is great. It has many of the same GTD features that SaaS services like RememberTheMilk.com, but has but with more potential (in my humble opinion).