By the way, there is a change on my workspace setup. I am now using Eclipse Indigo with Android SDK plugin and an Android 2.3 emulator.
The missing part in my last session's code of the todo-list is the database. The key is creating a ContentProvider. Extend this class and override the methods. This is where the codes for delete, insert, update, query are.
In our internal training at the office, we coded for the functions of insert, update and delete records. I couldn't post the actual code here, so I'd just be summarizing our activities.