This thing right here is a solar powered MP4 player and Nintendo emulator. Yes, Nintendo emulator. You can load an SD card up with songs, videos and less-than-legal ROMs and have it handle them all. It can play NES, SNES, Game Boy and Game Boy Color games, delivering plenty of retro gaming goodness on the go.
In addition, you can use it as a stand-alone solar charger for devices such as your laptop, giving you extra juice on the go, provided the sun is out. It also has a flashlight built in for some reason, as if it didn't have enough features already. It's $120, an amount that would be well worth it for anyone who wants to play Chrono Trigger on the beach all day without having to recharge.