In keeping with the fine tradition of Samsung handsets being Rooted before release we are happy today to report that the Galaxy S3 has been Rooted, courtesy of none other than Chainfire. This Root is currently working on a pre-release firmware, so its worth bearing in mind that Samsung may yet make changes in the release firmware that prevent this exploit from working.
Full details are available here.
Before we sign off, here's a quote we very much enjoyed from Chainfire himself, which sums up our feelings about other companies bootloader policies rather nicely:
Now, everybody say thanks to Samsung! I don't always agree with them, but so far they have been the first and IMHO still are the only high-end Android OEM who aren't complete douchebags in the unlock department!