Android applications can easily be linked together using intents. One example of this involves Shazam, MySpace, and the Amazon MP3 Store. Once Shazam has identified a song, you can also search for the artist's official MySpace profile page or buy the song via via the Amazon MP3 app. Here, the three developers behind these apps talk about how they accomplished this:
To hear more about how the MySpace app for Android was built and lessons learned, watch Matt Kanninen:
Tomasz Zawada of Shazam also talks about his opinions on the Android platform and has some tips for developers building Android apps:
These and the other Android app developer videos can be found here.