http://www.heise.de/tp/r4/artikel/20/20788/1.html
This article, while sadly only in German, is about newest Spitzer data, which shows that our galaxy is not an ordinary spiral-galaxy. Its a subtype with two beams in the centre with an extension of 27.000 lightyears.
the article a ssuch has not munch info on that, it more gives a short summary of the development of the galactic model. But it has a picture of the "new" Milky Way.