OK - the Stand N Splitter by Kikkerland is not the greatest design piece... but it is so incredibly useful!
No need to carry two accessories for your phone or MP3 player any longer. Stick the suction cup to the back of your device and prop it up for the correct viewing angle.
Want to share audio with your friend? Unplug the suction cup and insert the 3.5 mm jack into your headphone jack and this becomes a 2-way splitter.