When I plugged in my phone just before I went to work, I saw that there was a new firmware update for Galaxy S. So it must be Gingerbread (I have already Froyo) and i'm going to install right away when i come home!
EDIT: Sorry, read the comments below... It's not Gingerbread but 2.2.1
EDIT: Sorry, read the comments below... It's not Gingerbread but 2.2.1