Yesterday, one of my alum student workers stopped in to chat (and for other reasons). She let me know that she was working on updating her resume and cover letter because a company she had applied too and never heard anything from (or just didn’t get pulled through to an interview or something like that) had personally contacted her to let her know that there was a position opening up in their company and they wanted her to apply for it. Just another example of how important it is to keep you LinkedIn updated and professional and to keep your resume updated. I personally like to keep an updated version of my master resume updated.
Even when you are established in your career, you never know when a new opportunity might come up. As you move in your career, make sure that you are periodically going back to that resume and keeping it updated. Any other professional websites/social networking that you do, keep that updated as well.