Got an iPhone? Here are my picks of the best apps for kids — though many of them are adult-friendly too.
Autodesk Sketchbook Mobile is the best painting app out there. Brushes and Sketches are OK, but not as smooth. Sketches lets you add speech bubbles and other shapes, though.
OldBooth Premium lets you put a person in an old-timey photo. Smooths edges really well, too.
Quad Camera is a really fun photography app that takes many shots one after the other and arranges in a grid (usually 2×2) with or without effects.
Pianist is a great piano. Guitarist is a great guitar with many modes. Band has a selection of instruments at lower quality.
Ocarina is like a recorder — you actually blow into the mic and play it on the touch screen. Zephyr is a fun "painting with snowflakes and music" app which lets you share your paintings with the world.
Preschool Adventure is the best all-purpose small child entertainer. Dex ABC Animals is flashcards with cute pics — but ZEE for zebra and I for Inchworm and N for Nightowl always bug me. Peekaboo Farm is very simple but could be fun. iNeko is a cute, free cat that chases your finger.
Spider is a good game for young and old. Cro-Mag Rally or Super Monkey Ball might be appropriate for the slightly older.
Let me know if you'd like to try some of our Tickle Tap Apps (http://www.tickletapapps.com). We've just recently launched this set of apps designed specifically for young kids. I'd be happy to send a long a promo code for one of the apps if you'd like to try one out.