We've been working on the full newspaper option and some of the items included in it. Sudoku is almost ready, with 5 levels of difficulty and the ability to display the solution. Should be online really soon.
For the newspaper, we'll provide an easy way for everyone to create an application that is able to download those newspapers, and sync them with a device, or anything of that sort. We're also working on such an application for the Sony PRS-500 right now and we'd like to do the same sort of thing for the iLiad, but directly on the iLiad itself. This way you could get your newspaper/rss/sudoku directly using the wifi connection of the iLiad. In the meantime I've been using kovidgoyal's libprs500 and wget to create the same thing. Here's my .bat file:
Our "news stand" feature will work in a simple way. A GET or POST method on a given URL, with the right login and the MD5 hash of the password. If the login/pass is OK, you get a single XML file, with the name and URL for each of your subscriptions. "Subscriptions" will be on the website itself, with the ability to subscribe to RSS feeds, your own newspapers made out of various items, and sudokus.
It'll be really easy for anyone to port or create an app for different devices and OS this way.