I'm working on a customized template for LaTeX beamer. It's finished, except for some strange behaviour of textpost on the title page. Sample code:
\documentclass[t]{beamer}
\usepackage[absolute,overlay]{textpos}
\setbeamertemplate{navigation symbols}{}
\addtobeamertemplate{footline}{}{
\begin{textblock*}{100mm}(.5cm,.96\textheight)
This text should not appear on the title sheet.
\end{textblock*}}
\begin{document}
\title{Some title}
\begin{frame}
\titlepage
\end{frame}
\begin{frame}
\frametitle{Some frame title}
Some text
\end{frame}
\end{document}
The result looks like this:

It looks like the title page has two footers! But I don't want any headers or footers on my title page. I stumbled upon the option [plain], i.e. \begin{frame}[plain]
This results in:

So even though this gives a better result, there is still one footer left. It has something to do with the textpos package. I really need the options absolute and overlay for some other things in my template, so changing this is not an option. I was thinking about adding this text to the frametitle -- instead of the footline -- using \addtobeamertemplate{frametitle}, but this is not a very clean solution.
Any ideas how to fix this? Since I'm creating the title page from scratch, is there an option to clear the entire title page? Or anything like \pagestyle{empty}?
[Edit] Or any way to add a logo in the bottom right corner and some text in the bottom left corner without using textpos is welcome! But keep in mind that it shouldn't be exactly in the corners, there must be some whitespace around it.

\begin{textblock*}inside the frame. – Mobius Pizza Mar 21 '12 at 15:58textpospackage. These two blocks should NOT appear in the title page. – Ailurus Mar 21 '12 at 16:11\addtobeamertemplatecode after the frame containing the title and this will solve the problem. – Gonzalo Medina Mar 21 '12 at 20:51Have you checked out link?
– Mobius Pizza Mar 21 '12 at 22:40textpos. So, please give us a full description of the desired look for the footline. – Gonzalo Medina Mar 22 '12 at 02:19\logo? – Ailurus Mar 22 '12 at 09:01