Element55 KnowMore lets you search and review your activities for the previous day, week or month. Remember:

1) Time you spent on emails both reading and composing
2) Phone calls you made and received
3) Documents you spent time working on (and how much time was _focused_ on that document)
4) Calendared events
5) Web-based research from IE, Firefox, Chrome or Safari
5) And just about everything else under the sun!

Note that this app retrieves information about what you have been up to, but does not itself capture time from your android device. Pick up Element55 Time Capture Agent for that!