I got a ghetto $4 mount from monoprice.
I was able to use it with the OG Droid, Thunderbolt, and hopefully very soon, the S3. As nice as phone specific cradles are, I think it is kind of wasteful to have to get a new mount every time you get a new phone. Kind of hypocritical since there is nothing wrong with the current phone I'm replacing, aside from atrocious battery life.
Since I won't get anymore subsidized upgrades with Verizon due to unlimited, I will be running the S3 into the ground.