Cache Memory....

Cache Memory is well explained in this link
http://www.youtube.com/watch?v=4McNhpkDNpQ

Havefun while u learn

This is the very good blog,which i came across......

http://havefunwhileulearn.blogspot.com/2011_01_01_archive.html

Tools

Android Debug Bridge(adb) is tool used to control devices.for more info please follow the below link
http://developer.android.com/guide/developing/tools/adb.html