Baby Sign Language Dictionary App ($4.99)
The app has over 300 signs, which is about 45 minutes of instruction. Here's a screencap of Laura, my awesome signing boss, teaching the sign for "careful". There is also a fun quiz at the end. You can also try out the app for free here.
Baby Sign Language Everyday Signs Flash Cards ($.99)
This is the same as the regular flashcards you can buy, but in an app. There are also videos attached of Laura's adorable daughter Fireese teaching the signs. There's another quiz at the end too. There are pictures and words, so even non-readers can use them. CJ is obsessed with these flashcards. This one only has about 20 signs on this app.
Baby Sign Language Alphabet Signs ($.99)
This app is the same as the ABC flashcards. Similar to the everyday app, there are videos of Fireese teaching each sign. There's also another quiz. The app comes with a free download of MSH alphabet song which you can watch here. It comes in an American and a Canadian edition, eh. Really the only difference is zee versus zed.
ASL Fingerspelling Game ($.99)
This is a great app for both kids an adults to practice their fingerspelling (after you learn the alphabet with the previous app of course.) There's a couple of different ways to play the game, and it is a lot of fun.