Sort of a bit off-topic, but: on the VideoPress site, although I have Museo (Sans) installed, being a Windows Firefox user I do not seem to be seeing the right font. The different variations seem to have their weight number values in their actual names in the menu, which seems to be to blame. So, perhaps you could pop "Museo Sans 500" in as well as "Museo Sans", and so on, in the font-family values? I probably shouldn't care but I do.