http://www.mojecestina.cz/gramatika/c2009072305-ho ld-x-holt.html
http://www.google.cz/search?q=samsung+galaxy+mini+ mass+storage
I went Settings->Applications->Development->USB Debugging. On arriving there I found that USB Debugging was selected as the default for when a USB connection was made. I unticked it and, lo and behold, I was asked if I wanted Mass Storage!