Make sure your IE has the up-to-date patches (or switch to Firefox) and update to the latest Adobe Flash
Potent malware link infects almost 300,000 webpages • The Register.
A security researcher has identified a new attack that has infected almost 300,000 webpages with links that direct visitors to a potent cocktail of malicious exploits.
People who visit infected pages receive an invisible link that pulls code from a series of sites tied to 318x .com. The code looks for insecure versions of Adobe Flash, Internet Explorer, and several other Microsoft applications, and when they are detected it exploits them to surreptitiously install malware known as Backdoor.Win3.Buzus.croo. The rootkit-enabled program logs banking credentials and may do other nefarious bidding, Landesman said.
Another program which can help determine if you have all the latest updates and patches for your installed applications is Secunia PSI.
Just use firefox (on Linux). ;D