It's review time at my company, which like at most companies means some Word docs, some introspection, and a bunch of racking your brain trying to remember what happened in May of 2012.
One secret to writing awesome self-evaluations (or other career documents) is to keep a folder in your email that I like to call props. In GMail, I tag an email for "props" when I receive congratulations from people. This year, I was able to pull up notes from important people inside and outside the company who thanked me or praised me for my work.
It's a pretty convincing way to make your case for a better raise, but even more, it's an easy way to remind yourself of the great work you do all year.