If you're like many people out there, you're unhappy at your job and just want out. You know you'll be able to focus more on your job search if you weren't constantly distracted with work - and you wouldn't have to make up so many fake doctor's appointments that your boss thinks you're deathly ill. But should you do it? Should you leave your job before you find a new one?
If you can afford it - that is, if you can afford being unemployed for several months - then it might be work it to just take the leap.
But here's the trick: find something "real" to do with your time. Start a business. Chip in at a friend's startup. Re-code your college senior design project in more modern technologies. Just do something!
You'll have a much better answer what you are doing with your time, you'll keep your busy, you'll make your resume a bit more interesting, and, hey, maybe you'll learn something.