Other than purchasing a sophisticated web filter like Websense webfilter (the best 
in its class, which I have experience with), you may look at opendns.org...

It will probably prove effective enough to stop your annoying youngsters.  It takes 
over your DNS service, and prevents websites that shouldn't be accessed from being 
resolved.  Its not foolproof, but its effective.

Other than that, I don't see blocking ports on a firewall or blocking certain IP 
addresses being effective.  Because realplayer can stream over port 80 also.  And 
many websites offer the content, so it would be difficult to find and block them 
all.  However, some network monitoring could provide you with all the most popular 
sites they visit.  Then you could block them at the firewall.

One question... Why not inform these students that they are not allowed to access 
these sites, and that their actions are being monitored.  If they continue to violate 
the policy their privileges or job will be lost.

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