Just grabbed our tablet and checked...
In Settings, Applications: RAM 386MB Used, 301MB Free
In Task Manager (RAM manager): 532MB/687MB
There are 3 active applications running.
Interesting to note the discrepancy between the two areas of ram reporting within the Operating System. Although 386+301=687, used RAM does not concur. Perhaps the Settings program is consuming a significant amount of RAM explaining the used RAM discrepancy.
I clicked the "clear memory" button in task manager / ram manager and now it reads 296/687MB
Clicking "clear memory" results in the closing of open applications. The 3 active applications are now closed, reading 0 active applications.