Interesting thing I just discovered with my Google Reader here at school - You can read the pop-up blog posts in Google Reader, even if the home site is one that is blocked at your school site. This is something new to me, at least.
I started following Sarah Dessen's blog (Just Listen, Lock and Key) on LiveJournal, which is blocked here at school. However, when I checked my Google Reader blog roll, I could still read her posts in Google Reader. What a concept! I think it's just great that a web 2.0 tool is helping me to get around the block my district puts on this kind of site. Who knew! Try it for yourself.