http://www.benmccann.com/dev-blog/android-audio-recording-tutorial/
http://developer.android.com/guide/practices/ui_guidelines/index.html
http://www.ibm.com/developerworks/opensource/library/os-android-networking/index.html?S_TACT=105AGX54&S_CMP=C0611&ca=dnw-1023&ca=dth-o&open&cm_mmc=5479-_-n-_-vrm_newsletter-_-10731_118478&cmibm_em=dm:0:13881280 - networking with Android
http://www.ibm.com/developerworks/opensource/library/os-android-sensor/index.html?S_TACT=105AGX54&S_CMP=C0618&ca=dnw-1024&ca=dth-o&open&cm_mmc=5515-_-n-_-vrm_newsletter-_-10731_119403&cmibm_em=dm:0:13881280 - sensors and media recording
http://www.ibm.com/developerworks/library/x-android/?S_TACT=105AGX54&S_CMP=C0625&ca=dnw-1025&ca=dth-x&open&cm_mmc=5560-_-n-_-vrm_newsletter-_-10731_120138&cmibm_em=dm:0:13881280 - Working with XML on Android
http://www.ibm.com/developerworks/opensource/library/os-eclipse-scala/index.html?S_TACT=105AGX54&S_CMP=C0702&ca=dnw-1026&ca=dth-grn&open&cm_mmc=5600-_-n-_-vrm_newsletter-_-10731_121143&cmibm_em=dm:0:13881280 - Program in Scala on Android (using Eclipse)
Graphics and 3D
http://developer.android.com/guide/topics/graphics/opengl.html
http://www.android-tactelus.com/ - series on 3D programming (from http://androidandme.com/2009/07/news/want-to-learn-how-to-create-a-3d-fps-engine-for-android/ )