Last couple days I have been guilty of trying out many ICS ROMs for my Nexus S and I think I may have found a good ICS ROM for it, the AndroidME ICS ROM.
I am not going to define a good ICS ROM here by judging its features and listing them but from experience of using these ROMs. And based on that, the AndroidME ICS ROM is one of the smoother ROMs on the Nexus S.
Of course, there’s more work to do like matching up the ROM with the right kernel to make it even faster/smoother but we will have that later this week.
In the meanwhile, go ahead and try this