To quote: Additional new features in the 3.50 update include:
• Facebook Integration: Developers will be able to create PS3 games that have more interaction with Facebook. Once compatible PS3 titles are available, PS3 users can choose to access public information on Facebook - including user name, profile, uploaded photos and friends list - to enhance their gameplay experience.
• Grief Reporting Function: Users can send claim reports directly from the XMB for any inappropriate messages they receive from other PlayStation Network users. This feature is accessible from the option menu of the messages list in the FRIENDS category.
For more details and instructions on how to update the system software for the PS3 system, please visit http://www.us.playstation.com/PS3/Features/SystemUpdate.
As always, we look forward to your feedback.
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Higher the version of FW you'll update to the lesser the chance to get that crack soon (if ever) so don't keep up your hopes - even 3.42 might be hard nut to crak and I bet Sony made even more security improvements with 3.50 just to asure it will be protected.
Bottom line - it you're planning to use JB stay as low as possible with your FW or just go and buy new PS3 while those in stores are still around 3.30 to 3.40 versions
This is not true. The firmware at http://dus01.ps3.update.playstation.net/update/ps3/image/us/2010_0727_00c835be718fc3d5f793e130a2b74217/PS3UPDAT.PUP still has a md5sum of e07d2b84c9e9691c261b73e5f1aada20.
 Obviously, it'd be wise to double check the md5sum yourself just in case they do now change the image. They do have that ability as 3.41 was reissued after the first firmware broke a number of PS3s.