I was a Passporter girl for a decade, but after discovering TripIt.com I must admit I tend to depend on it for keeping all on my plans and trip information online now. I love TripIt, and have even toyed with the idea of upgrading to the pro version. It's so easy to use, and I can keep every detail of my trip in one place. With the app I can even have all of it on my phone.
I do still make a spreadsheet that I call my "quick look" because I'm not happy with how TripIt looks when you print it out. But if I forget to stuff my quick look in my purse, I know I have my app to fall back on.
What planning tools do you use? Are they web based, or do you create your own?