Hushmail reviews?

[P.J. Ponder]

The Hushmail website (https://www.hushmail.com/) notes that the service
was reviewed by security experts and it seems at first glance to have some
interesting features.  Source code for the Java is available for review,
too.

Any views on this?  

tech overview:
https://www.hushmail.com/tech_description.htm