While viewing this post from your device, just tap on the download link below the screenshot for whichever menu you'd like to "Install", and it will appear in the Settings app on your device. This will work on non-jailbroken devices without any issues.
I mentioned this on Twitter awhile ago already, but figured this was worth noting here as well.
It's been in plain sight since the beginning of February when BGR posted their exclusive photos of debug output from an iPad 3 development unit. The (full) last line says:
vm_page_bootstrap: 244276 free pages and 8396 wired pages
So, just do some simple math:
244,276 (pages) x 4,000 bytes (size of a page) = 977,104,000 bytes = 977MB
CORRECTION: chpwn pointed out to me that my "size of a page" above may be inaccurate, so here it is again, fixed:
244,276 (pages) x 4,096 bytes (size of a page) = 1,000,554,496 bytes = 1GB (rounded)
The Gold Master build of iOS 5.1 has been in a vigorous quality assurance phase for the past three weeks, with extensive testing being done internally by Apple as well as by various carriers/partners.
It is rumored to have added Japanese language support in Siri, as well as an easier method of accessing the camera from the lock screen, and at least two other new features that have not been publicly leaked.
The build number of iOS 5.1 Gold Master (Codename: Hoodoo) is 9B176 according to a very solid source, although three different partners who are testing the Gold Master claim to have slightly (by single digits) higher builds numbers on their copies, I'm assuming that's because right now it'd make sense for those people to be testing what will soon be released as 5.1.1, so I've disregarded the claims.
Some tech blogs claim to have the build already, and while they may have a leaked copy, Apple is not signing the Gold Master firmware on their external servers yet. This means that leaked screenshots can only come from a device that belongs to someone geniunely testing the firmware, so they are probably going to be hard to find until official release, which should be in the coming days.
