The list of things you can do with Bitcoin is endless. You can use Bitcoin to invest and shop. Many online stores (such as Overstock.com, Expedia and many others) accept Bitcoin in the same way they would other payment methods.
Some of the things you can purchase with Bitcoin include common household items and video games. Microsoft have recently started offering games and other apps for bitcoin. Some Minecraft servers are actually using the bitcoin network to power their in-game currency. Bitcoin has also become quite popular with travel uses. For example, some agencies allow you to pay for hotels, book a flight with CheapAir, or take a cruise with Ships & Trips Travel.