Well, there is loads to read about in all Joomla! Forums:
forum.joomla.org/index.php/board,267.0.html
Or just do a search:
forum.joomla.org/index.php?action=search2&search=hacked
All he did is overwriting my configuration.php. I have restored the file from backup, set the chmod to 444 (owner, group and others to read only) and upgraded Joomla! from 1.0.7 to 1.0.10.
This is a big advice I can give to everybody. And always make sure to keep your third party components up to date. Check the Joomla! Security board (first link above) to keep yourself updated.
