You can watch iPhone 4S event keynote and official iPhone 4S video here.
Notcom has now updated his tool TinyUmbrella to save SHSH Blobs of iOS 5 GM.
TinyUmbrella is used by users to downgrade their idevice to an older firmware.
We know that SHSH blobs are specific to idevice and you cannot use SHSH blobs of others.Hence, it is advisable to save SHSH blobs of devices which Apple is still signing.
According to official blog of Notcom-
Sorry for the delay. TinyUmbrella has been updated for 5.0b7 and the recently released 5.0GM.
Work is still chugging along on TinyPwn. Hang in there folks. When it’s done I promise it will have been well worth the wait…
You can refer here to know how to save SHSH blobs using TinyUmbrella.
Notcom is also working on a new tool TinyPwn.
Download TinyUmbrella 5.00.12
Download TinyUmbrella 5.00.12 for MAC OS X
Download TinyUmbrella 5.00.12 for Windows