Again, it’s likely that the device is using 256 MB memory chips with a portion of the total being used for other purposes, such as video memory. Also, developers have noted that all of the 200 MB of user memory is not available for use by apps. The OS and background apps make use of a large portion of that memory.
Still only 256 megabytes, in 2010?
Makes you wonder if they’re really planning to have multitasking in OS 4.0.