Unless you have root on your phone you wont be able to do that, just imagine the confusion that would ensue if people started removing app shortcuts from the menu, no one would be able to find their apps and utter chaos would hover over the G1 community like a cloud of angry wasps. The only way to get them back would be to use anycut to put them on the desktop.
Personally I think removing apps from the menu is a bad idea, however you are going to come up with a valid reason why you want them removed to prove my doubt arent you?