\newgeometry ignores the landscape option so you won't be able to switch from portrait to landscape orientation in the middle of your document. You can use the landscape environment from the pdflscape package, but this won't take care of headers/footers or page numbers:
\documentclass[leavefloats]{apa6e}
\usepackage{,pdflscape}
\usepackage{lipsum}
\abstract{This is an example of of an abstract in APA. }
\title{A Template for APA Papers}
\shorttitle{APA: A Template}
\author{John}
\authornote{\dots}
\date{\today}
\begin{document}
\maketitle
\lipsum[1-10]
\begin{landscape}
\lipsum[1-10]
\end{landscape}
\end{document}
The landscape environment doen't rotate the header; to keep the header as defined in apa6e.cls when in landscape orientation, you could first remove the header/footer using \pagestyle{empty} and then use the background package to place the header; something along these lines:
\documentclass[leavefloats]{apa6e}
\usepackage[american]{babel}
\usepackage{pdflscape}
\usepackage{background}
\usepackage{lipsum}
\SetBgScale{1}
\SetBgColor{black}
\SetBgOpacity{1}
\SetBgAngle{90}
\SetBgPosition{current page.west}
\SetBgVshift{-1.3cm}
\SetBgContents{}
\abstract{This is an example of of an abstract in APA. }
\title{A Template for APA Papers}
\shorttitle{APA: A Template}
\author{John}
\authornote{\dots}
\date{\today}
\makeatletter
\let\StShortTitle\@shorttitle
\makeatother
\begin{document}
\maketitle
\section{lkadfjsjkdfg}
\subsection{test}
\lipsum[1-10]
\begin{landscape}
\pagestyle{empty}
\SetBgContents{%
\begin{minipage}[c][1.2\textwidth][c]{22.8cm}
\noindent\MakeUppercase{\StShortTitle}\hfill\thepage
\end{minipage}%
}
\lipsum[1-10]
\end{landscape}
\end{document}
\newgeometryto switch to landscape orientation somewhere in the middle of the document (if this is so, you won't be able to do it since\newgeometryignores the landscape option) or do you want your entire document in landscape orientation? – Gonzalo Medina Dec 12 '11 at 02:52\newgeometry. I thought it was\begin{landscape}– Tyler Rinker Dec 12 '11 at 02:53