\documentclass[xetex]{beamer}


\usepackage[brazil]{babel}

\usepackage{beamerthemesplit}

\usepackage{listings}

\usepackage{fontspec}
\usepackage{xunicode}
\usepackage{xltxtra}

\newfontfamily\callunafont{Calluna}

\setmainfont[ItalicFont={*},BoldFont={*},BoldItalicFont={*}]{Letter Gothic Std Bold}
\setsansfont[
	ItalicFont={Myriad Pro SemiCondensed Italic},
	BoldFont={Myriad Pro Semibold SemiCondensed},
	BoldItalicFont={Myriad Pro Semibold SemiCondensed Italic}]
		{Myriad Pro SemiCondensed}
\setmonofont[ItalicFont={*},BoldFont={*},BoldItalicFont={*}]{Letter Gothic Std Bold}
\defaultfontfeatures{Scale=MatchLowercase, Mapping=tex-text}