Yow! I'm in!
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Although I found the whole notion of Anakin's pure birth and the 'midichlorians' to be the silliest claptrap George could have pasted onto the Jedi saga, the idea of Anakin bringing 'balance' to the Force was one that made sense to me. As with all such metaphysical truths, though, that truth depends on the beholder's point of view.
Does Anakin cause changes of a political or social nature which bring about a sense of balance? One could argue that the Sith do indeed bring an opposing power to counteract the monopoly the Jedi seem to have in TPM, but that is not the same as seeking balance. By serving the dark side, the Sith are clearly choosing a side and seeking to promote that over the other...they seek to reverse the nature of things, not maintain them in an equilibrium.
However...from Anakin's own point of view, he does learn of both the light and dark sides of the Force, and I think this is what George was getting at. Anakin is the only character to completely embrace the dark side, and then (at the end of ROTJ), he chooses to embrace the light side. This gives him the truly unique perspective of having known both sides, so when he dies and returns to the Force, he brings that experience with him.
That is what I think that balance was about. A supreme spiritual realization that Anakin brought with him to the great beyond, not a changing per se of matters in the physical universe.
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"The entire universe is simply the fractal chaos boundary between intersecting domains of high and low energy."