how to juggle a job offer when you're waiting for another

A job offer is usually welcome -- unless it comes while you're waiting for the one you really want. How long can you put off the first company while waiting to hear from another, and what are the ethics involved in taking the first offer only to rescind your acceptance later? Head on over to U.S. News & Weekly Report, where my post today addresses these questions -- and as always, please leave your own thoughts in the comments over there.