ah well there's the question.
there are as many people will tell you the extra ram is real as there are people that will tell you for sure it's a trick caused by certain radio and base rom combinations. (tmous nk.exe and a tmous radio)
read this thread, it was well looked into.
i've always believed it to be true, (i ran the app that brandi made, saw it fill up, just like loads of other people, and i've used multiple ram disks and filled them up, so i am/was convinced) but since the 3.14 roms came along with their strange memory glitches i'm not so sure.
if i ever get time i might just flash the tmo 3.14, just to see what it does memory wise.