If you're a SHIELD early adopter, you may want to head into the settings menu and grab the latest update – it's a good one. Update 59 brings improved PC streaming stability, along with support for more PC Games, like FIFA 13, Call of Jaurez: Gunslinger, Mortal Kombat: Komplete Edition, and several other. There are now 31 officially supported PC titles. Not bad.
Aside from that, it also adds support for Tegra developer tools and possibly the most anticipated feature: the ability to move apps to the SD Card.