You can get it now. Just fire up your favorite Torrent client and look for iPhone OS 3.0 7a341. Everyone can install this, not just developers. Here's how it works:
Note: The image is called iPhone1,2_3.0_7A341_Restore.ipsw. It should be 230.1MB
Warning: Do this at your own risk
2:29 PM • I'm downloading it as I write these lines. Will tell you how the install goes in a few minutes.
2:43 PM • It's here. Installing right now. Remember to synchronize your iPhone first, just in case something goes wrong. That way you can go back to your last version.
2:46 PM • Press the alt (Mac) or shift (PC) and click on the restore button. Then select the disk image from your torrent download folder.
2:58 PM • Still at it after sync. All seems good. Would it work?
3:00 PM • Optional dork thing: Play the Back to the Future main theme to make it more exciting.
3:05 PM • "Verifying iPhone software now." (After Back to the Future you can play the Death Star Trench Run.)
3:06 PM • Bar is almost at half now in the iPhone. (Stay on target.)
3:07 PM • "Restoring iPhone firmware..." and iPhone bar at half.
3:09 PM • Still restoring iPhone firmware, but iPhone progress bar now at three quarters. (Dork playlist still going on. Now the Contact main theme is playing.)
3:11 PM • It's done. It's restarting right now!
3:12 PM • iPhone is up and it has re-appeared in iTunes. (Celebrating with Kim Deal singing Gigantic)
3:13 PM • iTunes is now restoring all my data. (you did synched before, right?)
3:14 PM • Almost there.
3:15 PM • Success! Data is now restored (that was fast! Usually it takes a long more).
3:15 PM • Another bar has appeared in the iPhone. Must be cleaning up something.
3:16 PM • OK, it's done. It has my setting now but is synchronizing, for some reason.
3:17 PM • Ah, it's now copying my address book, contacts, bookmarks, and applications. Guess the restore process is now different and that's why it is so fast.
3:21 PM • Still updating applications. Now installing "Rolando." Did I ever say how much I love Rolando?
3:22 PM • Now (re)installing SkyBurger while the Stones play Can't You Hear Me Knocking.
3:24 PM • iTunes is now copying songs. Going to cancel the song sync.
3:27 PM • Success! It works great. Just wrote an email in landscape mode.
7a341 is the golden master, the WWDC'09 build that Apple will distribute next week— if nothing extraordinary happens. It works great, so download and enjoy.