While browsing the XOOM xda forum today, I saw this announcement of HoneyReader, a new application built specifically with Honeycomb tablets in mind. Because it doesn't have to support pre-Honeycomb versions of the OS or small-sized phone screens altogether, the authors concentrated on making it a great tablet experience, and I must say, their first take is pretty good.
HoneyReader uses the native to Honeycomb Fragments API that on the surface translates to fluid and flexible UI elements that can divide the screen into separately scrollable independent areas with their own lifecycles. If you're familiar with the CNN app, for example, you know what I'm talking about (I personally think the Fragments API is the greatest thing in Android since... well, Android).
The app integrates with Google Reader, and its latest version no longer asks for your Google username and password, instead using the proper flow and simply prompting you to approve access to Google credentials stored in Android.
HoneyReader's main UI consists of a matrix grid of subscriptions (feeds), all of which you can see by scrolling sideways. Individual items in each feed can be seen by scrolling vertically. Additionally, you can customize the font size used in each feed column, thus creating a pretty unique UI, having the things you value more show up in a more prominent way. Such a UI wouldn't work very well on smaller screens, but looks and feels quite good on tablets.
Pulse, support Honeycomb as well, but because they have to keep phone interfaces in mind, none of them look and behave like HoneyReader (with Newsr being a notable exception).
To see exact how the current version of HoneyReader works, it's best to watch the following video recorded by the creators:
So, +1 for the Honeycomb app club. At this rate, we'll reach 50 dedicated apps soon :-/ Come on, Google, isn't it time for ADC 3 dedicated to tablets?