So I went to use my grinder for the first time in several months (bad... I know), and both the top and bottom burr mills had rusted like crazy!
I guess now I have to decide if it's worth it to just replace the burr mills or upgrade to something a little better.
If you are still using a blade grinder, this would be a great upgrade for $30.
http://home.woot.com/offers/burr-grinder-black-5