There is a patch available to download in Cydia that closes the security vulnerability used by JailbreakMe 3.0. Just do a search in Cydia for "PDF Patcher 2" and install from there. This closes the security hole immediately so you are not left open to malicious attacks after the jailbreak.
I'm sure Apple will release iOS 4.3.4 shortly that will also plug this security hole as they did with iOS 3.2.2 after JailbreakMe 2.0 was released last August.
I'm sure Apple will release iOS 4.3.4 shortly that will also plug this security hole as they did with iOS 3.2.2 after JailbreakMe 2.0 was released last August.