When you pick up medications at the pharmacy, wouldn't it be nice if you could choose how often to receive those papers that come with them? Here's my quick UI fix to a Rite Aid screen.
You've likely seen the "smiley ranking" at stores. IMHO, it could use a little tweak to be more effective.
During a website redesign, I took some data that wasn't helping anyone and made it more meaningful with the help of a pie chart.
Send your users information that will save them having to do searches for information on their own, and they'll love you for it! Attach useless PDFs and they'll be annoyed.