The blocks are put there for a reason. Don’t try to get past them. Seriously, why on earth are kids so addicted to MySpace/Facebook, surely if all your friends are on there (if they’re the same age) are in school to so it’s no use anyway, right?
Oh. Your school sounds really…lax…seriously, so many blocked proxy sites, but they’re just blocked. At my school, try and access say 5 blocked proxies in a row, bam your PC is shut down and a techy is on his way to take you off the network, I tell you from experience ;)
To answer your question however as I guess I should you could do a couple of things:
1) Create your own proxy server on your home PC
2) Use IP’s instead of URL’s as they don’t always block those
You could even try using translation sites (which are blocked at my school because of this very reason).
But really, there is no point to trying to get past them. If you’re that addicted to MySpace you need help, 7 hours away is nothing, does much really change in that time length anyway? (Wait…wonders of the web…MySpace…cringe)