Apple has just released iOS 4.0.2 for iPhone and 3.2.2 for iPad to fix the PDF exploit that makes jailbreak.me work. That means the jailbreak for iPhone 4 (jailbreakme.com) will not work after updating to iOS 4.0.2 for iPhone and 3.2.2 for iPad.
The update has no other features except fixing the PDF exploit. You can automatically update to this version of iOS via iTunes. Here are download links to download iOS 4.0.2 for iPhone and 3.2.2 for iPad.
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