When talking about task management and productivity on the web, I can only think of one to do list to rule them all. Remember The Milk has tons of features, it is fun to use and offers real collaborative power.

The heart of Remember The Milk is a structure that allows you to add a huge amount of data to each task. You can choose a location on a map, then group by locations, shown on the map, you can add dates, invite users, add tags, etc., etc. The reason I find it very useful and flexible is the relaxed approach it takes. Don’t know what date your task is due? Simply type: “tomorrow”. Elegant, and simple. You can also input “the day after tomorrow” and “next Wednesday” for example.

You can apparently create unlimited lists, and easily copy items, copy lists, mark items done, and when an invited user marks an item done, it will show up done for you as well. I just love this service, if you really need more and can’t decide, just look at the logo. How cute can you get?