Today, we had to write a cover letter for something and I was the only person that had no problem with doing it. Apparently, most people have an issue with self-promotion. Not I, not I indeed. I figure if you can't promote your best skills, then you have issues. I helped them too, since I'm nice like that.
For example, I would not put on a cover letter that I am really lazy and look for a high-speed internet connection in a job, b/c I have a short attention span.
Instead, I'd focus on the positive. Lazy can translate to "Able to work in high-pressure environment." Why high-pressure? Well, b/c I'm lazy and put stuff off until the last minute. But once its due, well then, bitches, I rock.
Internet addiction? Similarly, one could say "Able to multitask" (you don't have to say "with multiple browsers open at once").
Really, when its stuff I love, I'll work my ass off. Ask Evil Randar. Its just a matter of presenting your best skills in the best light, and then presenting your worst things in a non-detractive light.