some typos

source/talk.tex

@@ -36,7 +36,8 @@ Bad things can happen and do happen:
 \end{frame}        
 
 \begin{frame}
-        \frametile{What to backup?}
+        \frametitle{What to backup?}
         It is important to distinguish what it is necessary to backup from what
         it is not.
+\end{frame}
 \end{document}