It seems a lot of companies discovered a lot of vulnerabilities recently...
Oracle Patch Tuesday heads-up: 81 database security holes (ZDNet)
Including a fix for a no-authentification-required, remotely exploitable flaw.
Microsoft planning Patch Tuesday whopper: 16 bulletins, 49 vulnerabilities (ZDNet)
New Highscore! Windows 7 is concerned by nine updates (!)
Adobe ships another mega-patch for PDF Reader (ZDNet)
Adobe fixes huge flaws in Reader. Again.
Java mega-update plugs 29 critical security holes (ZDNet)
All but one of those are remotely explotable without authentification. In other words, if a hacker knows you have an out-of-date Java version installed, he can take complete control of your computer without any action on your side.
Better: Since Apple usually delays Java updates for months (they are maintaining Java for Mac) all OS X computers are vulnerable.