Here is a list of features that work on both devices,
- Harware Acceleration
- Wi-Fi (you have to do manual scan)
- Contact Sync
- Mobile Network (Data is not working, even after manually entering APN settings)
Now lets see what does not work,
- Calendar Sync
- Video Recorder
- External SD
Just a week after the ICS sources were out there is already an alpha version of ICS for Galaxy S users. I'm sure pretty soon we will see a stable build will all the issues ironed out!
The pictures of Ice Cream Sandwich running on Samsung Galaxy S GT-I9000, check the link mentioned here.