Hah cool, I think EOG is the way to go with this type of thing (and it's just cool).
The Serial C# grapher that got posted inspired me to write an app to go with this. I've been using KST in linux to do the graphing, but now I'm going to try writing my own specifically for this, maybe with an integrated dream journal to tie journal entries with the graphs. And it'd be nice to configure everything from an app instead of accessing a menu through minicom.