You need to select an outer theme. \useoutertheme{infolines}
should give you the desired format.
If you just want to include the numbers, you have to adopt the original code for the footline
from the outer theme shadow
which in turn uses the the format from the split
theme.
\documentclass{beamer}
\usetheme{Warsaw}
\title{How to number the ...?}
\author{My name}
\date{06.06.2005}
\defbeamertemplate*{footline}{shadow theme}
{%
\leavevmode%
\hbox{\begin{beamercolorbox}[wd=.5\paperwidth,ht=2.5ex,dp=1.125ex,leftskip=.3cm plus1fil,rightskip=.3cm]{author in head/foot}%
\usebeamerfont{author in head/foot}\insertframenumber\,/\,\inserttotalframenumber\hfill\insertshortauthor
\end{beamercolorbox}%
\begin{beamercolorbox}[wd=.5\paperwidth,ht=2.5ex,dp=1.125ex,leftskip=.3cm,rightskip=.3cm plus1fil]{title in head/foot}%
\usebeamerfont{title in head/foot}\insertshorttitle%
\end{beamercolorbox}}%
\vskip0pt%
}
\begin{document}
\begin{frame}
\maketitle
\end{frame}
\section{Intro}
\begin{frame}
\frametitle{There are many ...}
\end{frame}
\end{document}
Note that by moving the \title
etc into the preamble, this will also be used for the PDF metadata.