The System Idle Process can take anywhere from 16-32KB in memory. This doesn't affect anything since that's extrememly low and this process is the "kernel" of the OS and keeps the CPU busy (idling).
By the way, advent wasn't talking about the memory; he was talking about the CPU Usage, which, if the system is idling, should read as 99%.
Happiness is not about being perfect.
It is about seeing beyond the imperfections.