Create shared To-Do lists, shared tasks, set deadlines and reminders and snooze them, ping your colleagues when they're late, attach files, comment on your team's tasks, search and filter your tasks, create sophistica... more Create shared To-Do lists, shared tasks, set deadlines and reminders and snooze them, ping your colleagues when they're late, attach files, comment on your team's tasks, search and filter your tasks, create sophisticated work reports, send tasks and receive notifications on your email, IM, twitter and mobile phone... «less

Web/iPhone/iPad and there might be a third-party Android app. This is the one I use.

This is my phone that seems to be a pretty good. Founded the other day when i was looking for cloud basic versions, and it appears as they added support for this. No Android support.

This is what I use for Mac and iPhone. It's got excellent sync to the cloud, using a free service called SimpleText implemented on Google App Engine by the developer. I really like this because the data store is pl... more This is what I use for Mac and iPhone. It's got excellent sync to the cloud, using a free service called SimpleText implemented on Google App Engine by the developer. I really like this because the data store is plain text, so I can write my own scripts to access my task list. For example, I have a script that extracts my project list, and then I use GeekTool to show that project list on my desktop. No Android support, though. «less

Good, but has only iPhone, iPad and Mac support (no Android). Also, it lacks true sync, i.e. you must be on the same network to sync, and I want to sync via the cloud...