TILT: Losing track of time

Ok, I've been in my dungeon all morning messing around on the computer, checking out things on the web (Google Earth, Mac OSS, everything in my RSS reader pile). It just goes on and on. Is there any way to not just waste time doing this. Good thing I don't do this often -- I'd stop working altogether, which wouldn't be something my family would appreciate (they kinda like the paychecks -- so do I). Wasting time. Now, off to another time wasting activity -- guitar playing and a run. Or are these wasting time too?