From what I can gather on the Android operating system is that it's unnecessary to run a task killer because the OS will prioritize what applications need to be running to suit your needs/experience at that particular moment and kill all others.
Furthermore the operating system will use the remaining phone memory as "swap memory" when RAM becomes scarce.
If this is true, could moving all your apps to the sd card effectively double your available "RAM"???
If not, would it be possible to implement this into a custom rom (bugless perhaps)???
Essentially all your apps would run from your sd card and if possible the entire OS.
I probably don't know what I'm talking about but I was curious.