This keeps happening to me. I go and find a handful of job openings on Monster.com or CareerBuilder.com, bookmark them, and say I'll apply to them later.
I come back after doing whatever and I see that they no longer exist. Meaning, I waited too long and someone else got the job, or the hiring person didn't want to wait any longer and pulled the advertisement.
Just great. I could have applied to the position and had one more possibility. Another lesson in the world of job-searching. Don't wait at all.
I need a job.