One of the pieces of advice that I give in my talk "The Modern Resume" is that you should review, and likely touch, your resume once a quarter. It was a habit I got into when I worked in the corporate world after having a startup company that I worked for fail.
That experienced bothered me, I didn't like the instability near the end of that company's life, and so I decided that I didn't want to get caught in that situation again. When I went to JD Edwards, there was a feeling of instability at times before they were purchased by Peoplesoft, and it seemed I was reviewing my resume on a regular basis then.
My simple advice:
These simple steps should take you 5 minutes a quarter, and it's worth it for managing your career.
And if you have nothing to add, think about that as well. Perhaps you should be looking to grow your career a little and undertake something worth adding to your resume.