You've been offered a middle management position with a startup company. Great news! There's only one problem: You're arriving at this new job fresh off a senior management position with a Fortune 500 company.
Sometimes you have no choice but to take a step (or two, or three) down. In a sluggish economy with few available job prospects, your options may be limited to a lower position -- or no position at all. If that's the case, you've just got to grin and bear it until you can move up within the company or the job market corrects itself.
If you do have options, don't choose the position that's going to detract from your otherwise stellar resume. When you're forced to take a lower-tier job, at least make sure there's room in the company for you to eventually move back up to the level where you belong.