iPhone 3.0 beta 2 is now available for Download

Apple unveiled the the second beta release of its iPhone 3.0 OS to developers which introduces the Push Notifications and In-App purchases for which all developers have been longing for. Apart from these new features, there is also a lot of improvements stability improvements and bug fixes.
The iPhone 3.0 beta 2 build, now labeled as build 7A259, can be downloaded using any of the links below for your specific device.

iPod Touch 1G
http://tinyurl.com/sizlopedia-ipod1g-beta2-p1
http://tinyurl.com/sizlopedia-ipod1g-beta2-p2
http://tinyurl.com/sizlopedia-ipod1g-beta2-p3

iPod Touch 2G
http://tinyurl.com/sizlopedia-ipod2g-beta2-p1
http://tinyurl.com/sizlopedia-ipod2g-beta2-p2
http://tinyurl.com/sizlopedia-ipod2g-beta2-p3

iPhone 2G
http://tinyurl.com/sizlopedia-iphone2g-beta2-p1
http://tinyurl.com/sizlopedia-iphone2g-beta2-p2
http://tinyurl.com/sizlopedia-iphone2g-beta2-p3

iPhone 3G
http://tinyurl.com/sizlopedia-iphone3g-beta2-p1
http://tinyurl.com/sizlopedia-iphone3g-beta2-p2
http://tinyurl.com/sizlopedia-iphone3g-beta2-p3


Installing iPhone 3.0 beta on the iPhone

Make sure to have downloaded the iPhone 3.0 beta firmware that relates to your iPhone (2G or 3G).

Extract the firmware IPSW to a folder.

Connect the iPhone to your computer.

Get the UDID registered on the iPhone Developer program.

Open iTunes and click Restore while holding the Shift key (for Windows) or Option key (for Mac).

Locate or browse to the firmware IPSW.

Wait for iTunes to unpackage and install the firmware.

Note: Attempting to do this upgrade on a unlocked iPhone can make it useless forever. Even the AT&T locked iPhone users will need to get their UDID registered before trying to upgrade.

Installing iPhone 3.0 beta on iPod Touch
iPod Touch users are pretty safe in this case as there is no question of baseband like iPhone but their is still a catch which I shall be mentioning further below.
Once the firmware has been downloaded, extract the IPSW to a folder.

Connect the iPod Touch to your computer.

Get the UDID registered on the iPhone Developer program.

Make sure to disconnect from Internet such that iTunes cannot communicate with the web.

Only then, open iTunes and click Restore while holding the Shift key (for Windows) or Option key (for Mac).

Locate or browse to the firmware IPSW.

Wait for iTunes to unpackage and install the firmware.

Note: Step-3 is optional for iPod Touch users but in case you decide not to get your UDID registered, you won't be able to Sync with iTunes. The upgrade method is valid for both iPod
Touch 1st Gen and 2nd Gen.

Please note that after upgrading to iPhone 3.0 beta, you might not be able to downgrade to firmware 2.2.1 later on so it is always a good choice to wait for the official release which is due in summer.
iPod Touch users are always safe but I have already clearly warned the iPhone users to proceed at their own risk.