The following works for me using Ubuntu 8.04 and texlive from the repositories. My test file looks like:
Code:
\documentclass[landscape]{article}
\pdfpagewidth 11in
\pdfpageheight 8.5in
\begin{document}
Hello World.
\end{document}
If I do "pdflatex test.tex" and then view the resulting pdf file in evince or in acrobat reader, it displays correctly. Note that the "landscape" option just tells the tex engine the dimensions of the region on which to lay out the text. (tex itself doesn't have much idea of physical page size.) The commands \pdfpagewidth and \pdfpageheight are needed also, otherwise you get landscape typesetting on a potrait page.
Perhaps some latex package provides a less verbose way to do this.
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