There's a 0-day Flash vulnerability with widespread exploitation going on in the wild. One source is
Slashdot, although it'll be on every big security site, including
CERT.
I highly recommend blocking Flash until this is patched, or avoiding unnecessary Web browsing (you never know which sites get exploited and serve up exploits). Right now, if you're running Flash, you're vulnerable.
Scary!
<edit>
Adobe's blog says it isn't actually a 0-day, but a known and patched vulnerability.
<edit2> I'm told that there are at least 20,000 sites infected with the exploit, and 250,000 more redirecting users to those sites. This is big!