A large number of infected systems we've cleaned recently were originally compromised by Blackhole. Be VERY careful what links you click in email (always try to check the link before clicking by hovering over it) and make sure Java and Flash are updated. This one exploits old versions of Java. 'Like' if you've updated Java recently!

IRS/Quicken spam leads to exploit kits and malware
A large volume of spam messages pretending to be from Intuit, the makers of QuickBooks, are flooding inboxes. Don't click the links, they lead to pages infected by the infamous Blackhole exploit kit.