My school used to use Bess... But we figured out too many ways around it
So they had to go with some state funding thingy.... You can get around it with proxies no problem.
Our schools IT guy is totally dumb in the mind. First off he is the second highest pay individual at our school ($70,000 a year) and he buys only Apple Macintosh crap. It sux. :-( The funny part is he doesn't know any of the school's network infrastructure.
He either gets me to do it or they hire a dude for $1000 a day. Basically, he sux.