It goes almost without saying that when you're looking for a job, you need to send out your resume. A lot. In fact, you've probably sent out your resume hundreds (in the current economy, maybe even thousands) of times. Indeed, with as many resumes and cover letters as you've sent out, it wouldn't be surprising if you've actually lost track of who's seen it and who hasn't, or even if you've submitted it to the same place twice, or forgotten to send it somewhere you thought would be a perfect fit. The fact of the matter is, being unorganized when you send out your resume can not only make hunting for jobs more stressful, it can actually cost you employment opportunities.