I was wondering the same thing - does anyone know if it were technically doable (and usable) to cannabalise some of the memory as a cache to supplement the RAM? And could this be part of the reason for the delay in iOS4 for the iPad? Making multitasking function fluidly?
Given what iOS4 has also done to both my 3G phones, I would worry that 4 could do the same thing to my iPad. The 3G phones still work but they are very laggy.
Sounds like a reasonable idea to use some of the SSD as RAM, just like we used to on desktops but without the time lag from writing to and from a spinning hard disk.
Wilson