The Phing and Propel Subversion repositories have suffered from long downtime periods quite often recently (last one was today). It is quite annoying as when it happens, you cannot easily update your symfony repositories, let alone the checkout of a symfony branch. To make things worse, the Doctrine repository also had some problems recently. A lot of symfony users are quite upset by the situation, myself being the first one.
To solve the issue once and for all, I have setup mirrors for these projects on the same architecture as the symfony one. It means that if the symfony repository is online, odds are the mirrors will also be available.
The symfony 1.2 and 1.3 branches have been updated to use the new mirrors. Nothing changed for symfony 1.0 as we were not using the remote repositories at that time.
The mirrors are open, so feel free to use them if you want (they are synchronized every 15 minutes from the source repository):