I use www.Astrid.com. Started with their excellent free Open Source app for Android... I always have my phone so a good app for it was important. It's both we

I use www.Astrid.com. Started with their excellent free Open Source app for Android... I always have my phone so a good app for it was important. It's both well designed and feature rich. It syncs with Google tasks and producteev so I have sometimes used those on the web, but their website has gotten good enough that I generally just use it when I'm at computer.