DotDeb has released PHP 5.1.1 packages for Debian GNU/Linux 3.1. Note: eAccelerator is currently not working under the PHP 5.1.x series.
Here the apt source for /etc/apt/sources.list:
Here the apt source for /etc/apt/sources.list:
deb http://packages.dotdeb.org stable all
deb-src http://packages.dotdeb.org stable all