Do you have a new iPad mini or a new iPad 4? It looks like the Dev-Team people are once again on your side, because they’ve released an update to redsn0w that allows you to save your iOS 6.0 blobs off to Cydia. Naturally, they recommend that you stick with 6.0 if that’s where you are at the moment.
They also note that several bug fixes come along with redsn0w 0.9.15b3, including an error that Windows users were encountering with the Restore button, as well as an iTunes error for stitched files. As per the Dev-Team blog:
Version 0.9.15b3 fixes the redsn0w “error 2601” that Windows users were seeing using the Restore button. It also fixes a related Windows iTunes error 14 for stitched files. Note that if you have a baseband, you should probably avoid stitching and simply use redsn0w’s native Restore (not iTunes).
Those lucky recipients of new iPad minis and iPad4s on Friday can use this redsn0w to save your 6.0 blobs off to Cydia. First connect your new device and turn it on, then use redsn0w’s Extras->SHSH Blobs->New and point it at the 6.0 IPSW.
I didn’t see any updates since, but they were also promising an ultrasn0w compatibility update for iOS 6.0 that is “mostly useful for 3GS old-bootrom users who are currently enjoying the untethered 6.0 jailbreak.” That will have the same baseband support as with iOS 5.x.Source]