You know you should negotiate salary, but sometimes it's hard to act on what you know. Other times, you do your best to drive up the offer, to no avail: it's either take the gig, and deal with the low pay, or stay put. (And if you're unemployed, that can be a particularly difficult option to contemplate.) This week's roundup looks at what one expert says about taking lower offers, plus how to tell when it's time to look for a new job, and a few hints that the hiring manager probably won't be extending a job offer.