As per the Apple edict, the various eBook Apps on iOS (Kindle, Nook, Kobo) have now removed the links from within the App to their own bookstores. Previously the companies could avoid having to give Apple their cut of ebook sales by directing customers to their own online stores and conducting the point of sale there, outside the Apple eco-system. Obviously Apple couldn’t let this stand, and their new enforcement policy came into effect yesterday.
All the Apps have now either been updated to remove the link to their store, or are offline while the App is updated to do so.
On a related note, the new Kindle update has now brought in support for magazine and newspaper subscriptions. iOS users can now select and purchase from over 100 newspapers and magazines (US only at this time), with Amazon promising more on the way.
The v.2.8 update also brings in the ability to share snippets of text or quotes via Facebook or Twitter.