This is an issue that's also on the Angular theme (which has been reported months ago, but hasn't yet been fixed!)
In Safari for MacOS the breadcrumbs don't wrap to the next line.
I must put emphasis on this because the iPhone uses Safari as default browser.
Therefore, every iPhone user is confronted with this issue.
You guys really need to test these themes on a Mac.
Screenshot Propulsion: http://farm8.staticflickr.com/7222/7182969261_c3bbd8826f.jpg
Screenshot Angular: http://farm8.staticflickr.com/7063/6897361753_8193a793aa.jpg
See also the Angular theme thread: http://www.kriesi.at/support/topic/filters-on-mobile-design