I stumbled across an online time / task tracking application earlier this year that caught my interest. It used a single input field for data entry that allowed specifying keywords / tags using the '@' sign. An example would be:
spent 4 hours trying to find time tracking app @wasted-time @12:00 @personal @sunday @follow-up
There seems to be a boom in online time tracking apps and I cannot find this particular one that I was interested in. I don't remember any other details bar the @keywords. I'm hoping someone knows of it.