The iPhone 2.1 is out. It contains the following updates as listed by Apple:

– decrease in call set-up failures andcall drops
– significantly improve battery life for most users
– dramatically reduced time to backup to iTunes
– improve email reliability, notable fetching email from POP and Exchange accounts
– faster installation of 3rd party applications
– fixed bugs causing hangs and crashes if you have lots of 3rd party applications
– improved performance of 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 2.1 firmware is build 5F136 (weighing in at 237.8MB) and can be directly downloaded through iTunes. The new firmware also contains a number of security fixes including the well publicized passcode flaw.

Jailbreak for 2.1 is not avaliable yet.