Notice: this information was written when Microthemer version 2 was current. On Dec 26th, 2014 version 3 was released with a completely new interface. Some of the information may be redundant, but as much of
the functionality remains the same in version 3 we haven't deleted this post.
U-Design has an option to activate and import Google Web fonts. When I activate this in U-Design settings, and import the fonts If I then edit a style with Microthemer and choose fonts, the Google fonts are not listed.