An anonymous reader writes: Here in the U.S., "being professional" means giving at least two week's notice when leaving a job. Is this an outmoded notion? We've all heard stories about (or perhaps experienced) a quick escort to the parking lot upon giving the normal notice, and I've never heard of a company giving a two week notice to an employee that's being laid off or fired.
A generation ago, providing a lengthy notice was required to get a glowing reference, but these days does a reference hold water any more?
Once you're reached the point where you know it's time to leave, under what circumstances would you just up and walk out or give only a short notice?