Samsung released the source code for the Android 2.3.3 Gingerbread update for the Samsung I9000 Galaxy S you can grab it now from their Open Source Release Center.
Download the Update Source Code GT-I9000_OpenSource_GB.zip
Of course, the source code would only be useful for developers but regular users should reap the benefits of this release soon in the form of new custom ROMs…The official Gingerbread update is rolling out for the I9000 Galaxy S (in Europe anyway) but the source code for the update will give custom ROM developers better access to the new additions to the Gingerbread-flavored Galaxy S firmware.