Finally there is some great news for Samsung Galaxy S i900 owners looking for an easy and pain lessroot. Senior Member, TGA_Gunnman, at XDA Forums has released a one click rooting tool for SamsungGalaxy S which not only roots Android 2.1 Eclair and Android 2.2 Froyo, but also gives you a one click unroot option.
Use Odin To Root Samsung Galaxy S i9000 Running Android 2.3 Gingerbread
Its only fair that Samsung’s most powerful Android device to date should be on Android 2.3 Gingerbread. While Samsung has announced that they would be upgrading the Galaxy S to Gingerbread, custom Gingerbread ROMs for the device are already available.