[Video Link] Adafruit's Circuit Playground looks like a major update to Collin Cunningham's earlier circuit design assistant app.
Circuit Playground simplifies electronics reference & calculation so you can have more fun hacking, making, & building your projects! This app is designed for both iPhone and iPad.
Decipher resistor & capacitor codes with ease
Calculate power, resistance, current, and voltage with the Ohm's Law & Power Calc modules
Quickly convert between decimal, hexadecimal, binary or even ASCII characters
Calculate values for multiple resistors or capacitors in series & parallel configurations
Store, search, and view PDF datasheets
Access exclusive sneak peaks, deals & discounts at Adafruit Industries
All that, plus updates with additional features & enhancements.