DarrkPhoenix: Scaling isn't necessary at all to accomplish this, all that's needed is good world design. The most typically used method is increasing the difficulty of enemies the further one gets from civilization (towns, major roads, etc). If the world is then designed well the player can get to and partially explore most major regions, but still have plenty of difficult areas waiting for them as they level up (or if they want to challenge themselves earlier, with a big payoff if they succeed).
Well that is how Skyrim is designed, so have at it. Go West at a low level and hit a hagraven and you're fucked. Head into the Northern hills at a low level and find a saber cat and you're fucked. Go near a giant camp before you're level 30 or so and you're fucked. Start certain quests too early and they will be very hard.
Though, I must say, the argument for the Oblivion system is that it allows total freedom, you can go anywhere at any time and do any quest at any time. That was the point of it, and that offers more freedom than the Skyrim/Gothic/Fallout method for certain. I'm not advocating it, Oblivion went way overboard, but that was the thinking and in that aspect it is true.
The only aspect of Skyrim that feels close to Oblivion in scaling overboard is the loot. Even then though, there is a lot of hand-placed and not scaled loot around, you just have to learn where it is. I already know where to go to get a Falmer bow right at the start of the game.