I've responded to an old Coding Snack Request with a small utility that some may find useful and/or fun. You can also find it here and here.
How Long Since? is a tool for finding the time that has elapsed since a particular date-time; you set the name of the event, its description, and the exact date and time on which the event occurred. Clicking a given event in the listbox, you'll be presented with time elapsed since that date. This value updates each second. You can delete a particular item by double-clicking it in the listbox.