Apple iPhone Software Update 2.1 Available via iTunes

Apple has released the software updates for iPhone and iPod Touch users, the update promises to fix

Decrease in call set-up failures and dropped calls
significantly improve battery performance
reduce time to backup to iTunes
Improved email reliability,
faster 3rd party application installations
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

The new iPhone 2.1 Firmware can only be download by connecting your iPhone to the new iTunes 8 so make sure to update it first, but remember that the update will fix [ the jailbreak, incase you did it ], the tool to jailbreak an iPhone on this update version is not yet available.