The iPhone 2.0 firmware update is available from Apple, according to both The Unofficial Apple Weblog and MacRumors. Though a check at the page devoted to the AppStore in Apple’s iPod Touch section indicates the firmware is “coming soon,” MacRumors found this link to the firmware in Apple’s xml files.
WARNING: before you go clicking on that link and downloading the firmware to your iPod Touch or your first gen iPhone, note that the firmware will wipe your device on install. Apple posted the following notice:
“Normally if you choose to update, the iPhone or iPod touch software is updated but your settings and media are not affected. If your device currently has a software version prior to 2.0 (1.x) and you are updating to software version 2.0 or later, all data on your device will be erased in order to perform install the new software. In this case, iTunes will offer to create a one-time media backup of your device depending on what content is on your device and what content is stored in the iTunes Library you are connected to. You should ensure that you have enough free space on your Mac or PC to accommodate a backup that matches the capacity of your iPhone or iPod touch (4 GB, 8 GB, 16 GB, or 32 GB) if you proceed with the this backup.”
We recommend you wait a few more hours for the “official release” of the 2.0 firmware. As “Auntie TUAW” noted, it’s not a good idea to go poking around on Apple’s servers to download random files for installs. Keep checking the Official Release link for updates.