When downloading from http://download.virtualbox.org via wget, files are saved/proposed with a different name, example for VirtualBox-1.6.6-Linux_x86.run:
url used: http://download.virtualbox.org/virtualbox/1.6.6/VirtualBox-1.6.6-Linux_x86.run
filename: VirtualBox-1.6.6-Linux_x86.run?e=1220828399&h=76fb79eb5def450604fa23f5f7a237dd
this occurs only for all the files actually hosted on dlc-cdn-rd.sun.com.
There is a way to fix this issue? under Gentoo wget is used by default from portage to retrieve all the files needed for the installation of a specific package (in this example for virtualbox-bin-1.6.6), and when the files are saved under with different name the digest verification fails.