At the heart Android is, of course, Google. And that means gmail, which we love, as well as Google contacts, which we loathe. It's completely normal to end up with multiple contacts for a single person (I think I have five for Casey). Google has had the ability for a while now to merge contacts. But now things are even easier.
When you go to your contacts, you should see something like the above. Hit the "Find duplicates" button, and it does so, taking much of the work out of your hands. From there, it will merge duplicate contacts, leaving things slightly less messy. It's still not perfect, but it's definitely a step in the right direction. [via jkontherun]