This isn't as easy as it sounds unless you are getting out side help. Or at least an opinion from someone who hasn't been starring at your resume for more then 10 minuets. (Hint: you)
Back when I was attempting a second job I was asked about my past job experiences. When I explained I was a temp back then, the wonderful woman interviewing me asked why I didn't bold the words 'temporary position'. She explained that it looked like I had jumped jobs when I hadn't.
Having since altered my resume as such I have gotten one call back and a few non-ding letters.
This might not seem like a big improvement, but to me it's amazing. Just by bolding a few spots I have gone from no answers & dings to a few positive responses. It makes me wonder what kind of responses I could have had if I had done this years ago.
Oh well, better now then never.