tagging and organization...

I wonder if there is a more effective way for us to organize the blog?
I would like to be able to search by both assignment and student - this would allow me to see if any significant revisions were made above and beyond course requirements.
BUT, it is difficult for me to comment on your posts in blog format. A google Doc would allow me to insert comments at any place. BUT, there is always the chance that a peer *could possibly* alter or erase your work.

Any ideas or thoughts?