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The first thing to keep in mind is that there is no threat from the Blackhole exploit kit to the vast majority of WordPress users that use WordPress.com. The vulnerability only exists when WordPress software has been downloaded and installed, and the websites are self-hosted. So if you aren't hosting you WordPress site, this is not an issue. The current wave of attacks seems to use an email requesting that you "verify your order" by clicking a link (sounds pretty familiar, eh?). It can look pretty legit, but, as you probably expect by this point, you click on the link, you go to a website that attempts to install malware on your system. The classics are classics for a reason, I guess.
If you make sure to keep everything patched, have an updated anti-virus program...and don't click on links in emails. You shouldn't have anything to worry about.