Well, as far as i know there is not much else then for a normal ISPConfig install...except teamspeak (but noone logged in). After removing vlogger it seems to be better right now (desided vlogger is useless because ISPconfig creates it's own logs):
total used free shared buffers cached
Mem: 255900 211204 44696 0 8712 116348
-/+ buffers/cache: 86144 169756
Swap: 506036 36 506000
...or does this still look bad?