yeah, i have shortened the glove box, i removed it, drew a straight line with a ruler and used a stanley knife to cut it out. pretty easy really, i also cut out the rectange for the cd player with it aswell,
the radio fits snuggly in the hole and is supported by a cage that came with the cd player something like this:
http://cgi.ebay.co.uk/Universal-ISO-Rad ... 3c9acd1208
the tight fit seems to work fine and support it enough, though it might be havin a little bit of help from the metal dashboard construction.
The good thing about keeping a bit of glove box means you can put you change for the car parking meter etc infront of you, rather than having to reach over to teh other glove box, which you couldnt if you just blanked it off like ive seen others do.
My wallet fone and mp3 player all seem to occupy the useful ledge aswell.
Also the blanking lid just clips in the glove box hole and covers up the radio which is good for security.