Such a great tool for collaborating with teammates (esp those in different time zones) to keep track of who is tackling what.

Love iDoneThis. Unless you are a farmer or a klezmer record producer or something you probably do a lot of ephemeral communication work day to day. iDoneThis lets you look back and see what you (and your team) have accomplished at the end of the week instead of the depressing feeling like you know you worked hard but can barely remember what you actually did.