At times I get kinda obsessed about the $-to-hour ratio of the games I play, so does anyone know of a program that can be used to measure how long you spend on other programs?

It's not terribly important to me, so it would have to be freeware.

Features I would like it to have:
-The ability to decide exactly what programs it registers. Knowing how long I use Firefox or Word isn't terribly exciting.
-Preferably I would want it to measure the total time spent, over several days/uses. Compiling daily reports or similar sound awfully boring.

Somewhat sleep deprived right now, so I can only hope that made sense. :)

You can use raptr or xfire.

Thanks, guys!