I have a confession to make. I am slowly becoming ROM junkie. I got my first android device about three year back(HTC hero) After it got old and was crying out loud for retirement, I got myself nexus 4g. Its cdma device and has its pains involved to make it work in India.
But anyways today I have installed AOSP ICS ROM on it with custom kernel(Glados). Making battery life in this baby almost 50 percent more.
If you are with same specs. I highly recommends you to visit XDA developers and get the ICS rom for your nexus S.
So bye bye gingerbread and Hello ice cream sandwich.
XDA aosp
Rigging and more 
how’s the keyboard? better than gingerbread,is it?
Its much better than gingerbread, there is app in market for ICS keyboard on GB,test that out meanwhile in testing, touch pal keyboard.