The core of this matter is the verse 4:34 of the Koran:
"Men are the protectors and maintainers of women, because Allah has given the one more (strength) than the other, and because they support them from their means. Therefore the righteous women are devoutly obedient, and guard in (the husband's) absence what Allah would have them guard. As to those women on whom part you fear disloyalty and ill conduct, admonish them (first), (next), refuse to share their beds, (and last) beat them (lightly); but if they return to obedience, seek not against them means (of annoyance) for Allah is Most High, Great (above you all). (Ali's version of the Koran, Quran, 4:34)
The problem, as often with ancient text (including the Christian bible) lies both in the proper translation and its dependence on a certain cultural setting.
So for example, the Egyptian (! not Western) grand mufti Sheik Ali Gomaa said (
source) that the verse needs to be seen "through the prism of the era". Beating ones wife was pretty certainly a common and frequent occurance in the society that Muhammed lived in. This verse actually restricts the beating of a wife in that society to a last resort. In a modern muslim society, Gomaa suggests, the beating has no place anymore.
This view is also supported by several other verses of the Koran and some Hadiths speaking out against harsh treatment of wives (inlcluding verse 4:128 which allows a woman to leave her husband if she fears abandonment or cruelty; and Hadith No 2139 (?) in which the prophet clearly advises men not to beat their wives). (
source)
Other interpretation go as far as to say that the word commonly translated as "to beat" actually means "to leave/abandon" (
the same NYT article as the first source)
Of course many muslims would disagree with such interpretations, and claim them to be modernists excuses not to follow disagreeable parts of Islam. Maybe they are right. But maybe they just want to use faulty translations of the Koran to stick to their own questionable ways.
But does it really matter? If the Koran is not a divine revelation (as both Christians and atheists surely agree), but just a manmade religion based on what some man named Muhammed may or may not have said some 800 years ago, then there is no "true" Islam, just different traditions with a common, somewhat obscure root. What "real" Islam mean in a modern world, therefore, depends on what modern muslims believe to be true.
Obviously some muslims believe that the Koran does not support beating your wife. And in the interest of muslim wifes - if nothing else, I think we should honor and promote this reading of the Koran, whether it was intended by Muhammed or not.*
*Personally I think - based on the verses and Hadiths I read - that Muhammed indeed sought to protect women from abusive husbands in a society where beatings were an all too common occurance.