Eucalyptus e-text reader

Eucalyptus is an interesting app for a few reasons. One, it seems to provide a pleasant user experience. Two, it leverages freely available material (a lot of it). Three, it is breaking the trend of the 99c app pricing.
This looks like a real app into which a lot of work has been put. I look forward to finding what comes up it.
Screenshots: 1 2 3 4