I've submitted reviews of several apps, all of which have been posted...except one. It was on Target's app for the iPad, where I mentioned (in non-derogatory terms) that WalMart and K-Mart might want to take notice and develop their own apps, given Target's success. I submitted the review twice, using slightly different words, and neither one has appeared. Interestingly, another reviewer mentioned Best Buy in a similar context, and that one passed the censor.
This makes me wonder: What are Apple's rules for censoring reviews that contain corporate names?