i'm pretty sure there are logs of all sorts of different stuff somewhere in OS X. just try a search in the Finder... should turn up something.
sounds like you're after some out there app, probably most likely not mainstream... i've seen a few keystroke loggers at some Mac 'hacking' sites, but i've never touched them. Mac users usually are a trustworthy group, but after all it is a
hacking site...
i'm sure if there is an app to record keystrokes, there would be something for tracking other stuff. good luck, and let us know if you turn up any useful apps.