Testing this on my Kindle Fire tablet...
The English main page seems to be a few days out of date, showing as featured article "Qayen earthquake" which was current several days ago. I'm not sure if this is a problem on the server end with caching or what....
http://en.m.wikipedia.org/ correctly shows "Miss Meyers" as today's featured article.
When I switch font sizes in settings, the toolbar shifts down and left about 4 pixels; this seems to correct itself after some scrolling.
The 'back' button frequently doesn't take me back to the previous article after following a link.... I seem to end up with multiple history entries for each page I go to, so 'back' goes back to the same page at first. Clicking on article links seems pretty unreliable and sometimes doesn't work?
We might also want to think about changing the font sizes; on a 7" tablet like the Kindle Fire (and the Blackberry Playbook) the default font size feels a bit too small, and "small" is just madness. :)
I got the app into some kind of state where it's failing to load articles or doing so vvveeerrryyyy ssslllooowwwllllyyyy, not sure I can reproduce that regularly though.
-- brion