As part of SBS 2003 Premium do you have ISA 2004 installed? If so you can
get some reporting from it. There are better 3rd party solutions.
Also FYI this newsgroup will be closed in a few days and you
will get much more attention in the new SBS Forum hosted by MS at the
following
location.
http://social.technet.microsoft.com/Forums/en-US/smallbusinessserver/threads