It would be nice if there was a way to get some feedback from the garbage collector, like give it a variable and find out how many references exist to that variable.
I've requested this several times, and didn't get any reply. Feel free to add your voice.
There's also a workaround ( which might break at any time ) from Dreamora in there.
http://www.blitzbasic.com/Community/posts.php?topic=62724#725019