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
The app would then parse the keywords into additional fields about the entry.
I can't find it again, given the abundance of similar tools on the net, and don't remember other details. Can anyone help?