This quiz app has easy questions, like "What color do you get if you mix yellow and blue?"  - the challenge is reading the Japanese to understand the question and the 4 answer options. Quick, fun reading practice.
Downsides - no lookup function, question bank not huge so questions repeat fairly soon. But FREE so can't complain!
Click to see this app in iTunes

 This is a Japanese in-browser look-up tool for the iPhone (like computer versions Rikai-chan or PeraPera-kun). Also works for texts, can copy and paste in emails. Save wordlists to export, use as flashcards.
Any other recommendations out there?

Japanese Podcast Recommendation (for a high JLPT N3 and above): Suntory Saturday, short interesting conversation/interview with different guest each week.
Any other Japanese study podcast recommendations out there?