Car Pools

I am developing a service to help people to car pool. It will be placed in the Easysearch portal, i.e. www.easysearch.sg. Are there already existing car pooling sites in Singapore that are well used? What do you like to see in this new website? Please give your comments here or send your views to kinlian@gmail.com.

Update
I checked Google and and saw many car pool sites in Singapore. See
http://www.google.com/search?q=car+pools+singapore&rls=com.microsoft:en-US:{referrer:source?}&ie=UTF-8&oe=UTF-8&sourceid=ie7&rlz=1I7ADBR

However, they do not seem to organise the car pooling by sector. I will use postal code to identify people who live or work close to each other. This will help them to search each other person better.