Project IP lists just about everything a webserver can find out about your computer. Your clipboard contents may be vulnerable.
Only works in Internet Explorer on the Windows platform. It reportedly works with varied success when IE is running in an emulator such as VMWare on another OS. If you have to use Windows, at least dump IE and use Firefox.
Rogue, evil websites can use this to steal potentially sensitive data from your Windows clipboard.
Fix it now!
Go to Tools – Internet Options – Security – Select a security zone – Custom Level – Scripting – Allow paste operations via script and set it to Disabled or Prompt.