Apple today announced the release of the iPhone 2.1 software update.

The update contains many bug fixes and improvements. To get it, connect your iPhone to your computer using iTunes 8 and click 'Check for Update'.

Update includes:

• Decrease in call set-up failures and dropped calls
• Significantly better battery life for most users
• Dramatically reduced time to backup to iTunes
• Improved email reliability, notably fetching email from POP and Exchange accounts
• Faster installation of 3rd party applications
• Fixed bugs causing hangs and crashes for users with lots of third party applications
• Improved performance in text messaging
• Faster loading and searching of contacts
• Improved accuracy of the 3G signal strength display
• Repeat alert up to two additional times for incoming text messages
• Option to wipe data after ten failed passcode attempts
• Genius playlist creation

More information can be found on Apple's iPhone 2.1 software update page.

Can anyone explain me what exactly is this genius playlist ? I own iPhone but have to wait for jailbroken 2.1 soft, and i can`t really find what it is on the internet.