Well, I took the above file, extracted it, took out the driver package (some people will already have them) and then put in busybox. Direct link:
http://ted.servepics.com/gnex/GNexus-root-busybox-package-nodriver.zip
It's in my i515 folder below, but please go ahead and put it in a dropbox as well since my server can get cranky sometimes.
Ooops, edited my sig and now its gone. . . .
and now it's back . . . lol