Yep, you read that correctly. It isn't officially available through iTunes yet, but the file is out there and can be downloaded and installed on your iPhone. I am updating the firmware to 2.0 on my iPhone this very moment. There's a link to the file inside this post.

In order to snag the file to update your iPhone's firmware, go to MacRumors here.

MacRumors reports, "In order to install the firmware, you will have to do it manually by pressing the Option key when pressing the 'Check for Update' button in iTunes. Then select the .ipsw file manually. If for some reason your download is a '.zip' file, rename it to '.ipsw' before proceeding."

I did this, and the it worked flawlessly. The iPhone is still updating. The firmware update is a 225 MB file, so it's going to take a while...

Stay tuned for more reports.