In addition to the existing devices, we've added a bunch of new devices especially for Pi. While you can still hang an sdcard reader on the GPIO port, and access files that way, the new nativeFile device behaves just like the old fileSystem device but accesses the regular Pi files. Simlarly framebuffer behaves like the old Arduino's tft device, but uses the Pi's built in graphics. Finally taking a leaf from the Galeleo there's the "system" device, which lets you run a regular Pi command from inside Sniff.
I'm planning on using a Syndrome from Disney Infiniti/Incredibles to trigger an RFID reader to shut down my Pi by running "poweroff"! (as soon as I've debugged the RFID reader).