Today, along with an excellent presentation, came the 3.0 “KirkVail” beta firmware. It was put up on the torrents just recently, so I have not had too much time to look into it, but so far it seems that (a) the firmware files are unencrypted, for example, just strip the first 0×30 bytes and there you have it, and (b) there is a new tag called TYPE. It is not “too” much use, but just tightens the vicegrip on our balls, so to speak. It does not really make much sense, since the fourcc at 0×10 of the img3 header could just be used, but the point of it is to assure that you are loading what you should be loading, for example, iBEC with the “go” command, the kernel and ramdisk with the bootx command, etc.
Since I know everyone is eager to upgrade, I must stress that you should wait until a new PwnageTool comes out if you want any jailbroken functionality. It is pretty straightforward to do the patches, as the Img3 files are not even encrypted it seems, but the ASR program does not just store the root filesystem DMG key in plain ASCII anymore, so that could be the one thing that might hold back the devteam on the new bundles.
Also, I would like to be the first to say, “Here we go again!” 
Note on downgrading: I have not done any testing myself, but from experience I know they cannot permanently disable you from downgrading. If you downgrade iTunes, and do a DFU restore with the downgraded iTunes, then it will let you go back to 2.x.
Links: Please do NOT share download links to the firmware in the comments.
Jailbreak: There will be no jailbreak for the 3.0 firmware from chronicdev or devteam until final release this summer. You may find half-baked (read: plist thrown together with just keys and IVs of fw files) quickpwn bundles from third-parties, but these are not guaranteed to work, and are definitely not supported by chronicdev or the devteam.
i did not take into account half-baked quickpwn bundles that take literally no effort to make
post updated
no the iphone dev team already has it done pretty much but its worthless because it is so loose and unorganized. so they are just like who gives a fak
lets not give this guy the attention he's asking for:-)
Thanks for deleting my comments, chronic.
Dude, don't post on this blog if your going to mouth off to Chronic. Show some respect. There basically isn't a jailbreak. The more appropriate way to say that would be to ask if he knows that there is a jailbreak.
how are you gonna tell the owner of the blog to go away ? how about you go away fag !!!!
rolen el link del firmware maricas