Well, for one thing, a lot fewer people rely on the MSM now. For another thing, the Alinksy info has been repeated on the internet in a lot more places than Free Republic, which has a substantial following anyway.
For a third thing, our side is now using Alinsky tactics against the Obama left.
Alinsky's methods were largely predicated on the expectation that his side would be a fringe bunch of crazies forever. His writings of the 1960's didn't take into account the eventual take-over, by the student radicals he helped give rise to, of the universities, the media, the philanthropic organizations, the educational system, the unions, and the government.
His "rules for radicals" were rules for a guerilla insurgency against "the power structure." Now his people are "the power structure," and, so become vulnerable to his own tactics.
What a delicious irony.