It happens often - I do something on a particular day, but can't remember when I did it. Then begins the painstaking process of recalling the past from memory. But there's a solution. Memiary ('memory + diary' pronounced 'memory') lets you store up to five tasks you completed today in Twitter-like brevity. You can then use the drop-down bar to choose the date in the past to see what you accomplished on that day.
I see some pretty good uses for this one. On the occasion your boss asks you what you did last Wednesday, for example. Or, this could serve as an excellent tool to monitor your own productivity. On a personal level, you could record dietary habits or exercise regimens. Some functions are currently in production, including an iPhone app (naturally) and the ability to export your Memiary to calendar utilities. One function I would really like to see is a search feature by keyword. For example, if I've launched a product, sent an email about it ... I would like to be able to see my past activities, as recorded by me, about that product by searching for it.