Trello2HTML
You can view detailed Trello Boards and export them to HTML (Save Page doesn't work). An ideal use for this is to generate and print weekly/monthly reports (at least that is how our team uses it.) Another use of this app is to directly append a board id to the hash, for example, the report for the official Trello Development is http://tianshuo.github.com/trello/#4d5ea62fd76aa1136000000c
The hosted version is on http://tianshuo.github.com/trello/ At the present moment, only Chrome is supported. (I haven't tested firefox yet)
There is also a blog article on this: http://tianshuohu.diandian.com/post/2012-06-08/Trello-Export-as-html
Fork me at https://github.com/tianshuo/Trello