Geocoding in Ruby On Rails

My boss quite impressed by the JARING BizOnNet portal. So he decided to give me a new task. To plot all the WiFi nodes in Malaysia installed by JARING.

The requirements will be :
1. Auto geocoding street address. For example, you put Jalan K/4 P11, Presint 11, 62300 Putrajaya, the system should be able to get the longitude and latitude for the address.

2. Display the Google MAP for geocoded address
This is simple, just get the lon/lat value and use YM4R plugins to display the MAP in RoR style.

3. Each node will have many users. So the DB relationship will be Nodes hasMany Users and User belongsTo Node

4. Category, will have 2 category, 512kbps and 1024 kbps. So the map ballon will be using customised icon. YM4R have this nifty function.

5. Tagging for each node for easy search