Apologies as I doubt that I am the first to have this thought, but I can't find anything similar in a brief trawl of the fora.

So I was thinking that it might be cool to have a graph of your score (the +/- rating which shows how the computer thinks you're doing) vs. move number added to the computer analysis of the site.  

I'm not sure what use it would be, but I like graphs.

Graphs are fun. :-)

Does this help in the interm?  - http://www.chess.com/tactics/help.html

- Josh