Here's an optional mod that might not appeal to everyone, but for Sonics fans and anyone else who'd like to send the Oklahoma City Thunder back to Seattle and restore the Supersonics, you can now do so in a few easy steps with Back to Seattle 07.
Back to Seattle 07 removes the files added by the NLSC Current Roster Update for NBA Live 07 via a batch file and also contains another batch file that will make the necessary changes to the DBFs. It doesn't affect your current rosters or lineups so you can safely apply it to a Dynasty in progress. Although there shouldn't be any problems in doing that, I highly recommend making a backup of your Dynasty first just in case; it's a good idea whenever you want to tinker with your Dynasty save, no matter how small a modification you're making. If for some reason you can't get the batch files to work, the readme file contains step by step instructions to manually restore the Supersonics.
Please note that reinstalling the latest NLSC update and any future versions will of course restore the Oklahoma City Thunder, but you can simply run the batch files again to bring back the Sonics.