Features include:
- Deterministic private keys
- No backup needed. No wallet.dat file
- Low bandwidth
- Low CPU usage
- Server cannot spend your coins
- Open source
- Free service, running on donations
Simply put the API is designed for making it easy to create light-weight secure Bitcoin wallets for handheld devices.
The sources include a very simple console based client, that shows how to use it. I am not an Android developer, and my hope is that the community will pick this up and make some great apps.
More information and the source: http://code.google.com/p/bccapi/wiki/WhatIsTheBCCAPI
Support the BCCAPI: 143SikKpjzwhBy5Z7Qg5knu5nKXWExSqQi