Anime News Network reposts that Amazon has pulled some yaoi manga titles from the US Kindle store. Amazon’s policy prohibits pornographic or “offensive” material on its Kindle eBook platform. However print versions of some of the titles pulled from the Kindle remain on sale from Amazon.
In addition to the usual censorship questions and anti-gay bias, one wonders why digital media is not being given the same leeway and respect as print. Much like the abuse of the DMCA take down provisions on YouTube, I think that because pulling  an eBook is easy and incurs little or no cost to Amazon, other considerations lose out.
It seems likely though, that once digital accounts for the overwhelming majority of revenue and profits, it won’t be so easy for Amazon, Apple, or anyone else to cavalierly censor materials based on the opinions of a vocal minority.