Hello, Welcome to the <b> test cast </b> .
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So let's <i> start! </i> .
First just see this :)
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And I hope you 
enjoyed this 
<u> screen cast </u> :-)
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<span foreground="blue" size="xx-large">Blue text</span> is <i>cool</i>!
You can use Pango Markup Lanaguge:
http://www.pygtk.org/pygtk2reference/pango-markup-language.html