At least, I'm assuming that's what it is. A bunch of people who sponsored me in the 2009 Blogathon got e-mails today reminding them to donate. If you donated back in 2009 (and I'm sure you did!), just ignore it. If you didn't, be advised that the link in the e-mail isn't valid; donate directly at barcc.org.
This is a Blogathon.org thing; I have no control over it. Sorry you got spammed!