Toggl is an easy time tracking tool. Purely focussed on tracking time on tasks, and allowing you to have insight in time spent. Cloud based and mobile, so you can track your time from anywhere at any time.
Look and Feel?
Great! Example for others, and very user-friendly
Some conceptual innovations
Easy to implement?
Can be used out of the box
Toggl is a good example of what a time tracking app should be, easy to start tracking time with a push on the button, without the hassle of setting up a large project administration. Just start tracking time and then fill out what it is for.
Works very well for people in solo roles, who need to track time for business purposes, or people who just want to have more of a grip of where they are spending time on during a day.