i notice that my maximum available/free memory (from sbs toggle) is at 267MB. using apps one on top of the other reduces this. the value also changes while i'm working within an application. does a small amount of free memory lead to freezing or soft reset of the iPad? sometimes, i'm in the middle of doing something important then everything stopped, ruining my work... is there a threshold where i shouldn't open any more app to avoid freezing/soft reset? is there an app to notify me if memory is running too low? is there a way to increase the total memory? double or treble the original? i don't want to experience that again... thanks!