organised itunes over multiple drives?

[Navid Mavaddat]

I was wondering if anyone was aware of a way to create a 'virtual 
folder' over multiple drives. My itunes folder is in excess of 170GB 
(lossless compressed from my CD collection) and soon it will be larger 
than the 200GB drive.

I am considering getting a 250GB drive, but I can see this will only 
ultimately be an interim measure. If I could span over multiple drives 
this would save much hassle. Currently I can't consolidate the library. 
I tried relocating 50GB off the drive, but it still wouldn't let me 
consolidate it.

-navid