I tried the new Kindle Cloud Reader today. During the initial setup, the service asks for more local storage than just 5MB, up to 50MB. That’s short of the 4GB that the Kindle carries but of course, since it’s in the cloud, that 50MB is purely for caching the book at hand and possibly book covers, scripts and styles that make the Reader load up offline if necessary.
When it requests permission to store more though, it asks under a special K4Wbooks name. I read that as, Kindle for Web books, but I’m not entirely sure that’s what it’s alluding to either.
In any case, the Cloud Reader is a great demonstration of a native app being turned into a web app. It’s not as smooth as it could be in a native format, browsers can’t draw that well yet and it doesn’t work in Firefox or Internet Explorer, but in the future it might. At the very least, it gives me more font and size choices than the Android version does.