Hello,
I tried mojeda's ServerStatus script here: https://github.com/mojeda/ServerStatus
The remote server is running with apache2, php5 (with curl) and mysql. Everything is installed with the original debian 6.0 source list and apt-get install ... And the status script shows the right Uptime and Load, but the RAM and HDD are always to high (80-98%) when in reality it's about 3%. I read that it needs exec and this should work because in the php.ini under /etc/php5/apache2/php.ini exec isn't listed under disable_functions =, of course safe mode is off too.
Thanks for your help! :)