This thread is for the Nexus 7 2012, Wi-Fi (grouper) model, ME370T.
"Nightlies" and changelogs are posted in this thread each time a version bump is made in the source with no official update on ROM Manager. Zips for the latest official are also posted until another "nightly" gets made. Links to the latest "nightly" zips will be in this post, as well as links to the latest official fastboot images via ROM Manager.
Current Official: 22.214.171.124 (Oct 6, 2013)
Fastboot links: http://clockworkmod.com/rommanager
Changelog link: http://v.ht/6043go
Use the appropriate fastboot command to flash on an unlocked bootloader:
fastboot flash recovery recovery-clockworkmod-touch-126.96.36.199-grouper.img
Final "Nightly": 188.8.131.52+ (Nov 4, 2014)
Flashable Zip / Changelog link: http://v.ht/6051gf
Zips provided to flash in the custom recovery of your choice.
Credits: I take no credit for any of the fantastic work done on the recovery; I'm just making it easier for the community to follow along by sharing builds from builder.clockworkmod.com (or mirrors.reflected.net for 184.108.40.206+) and packaging them as zips with a changelog summarized from the Github contributions. CWM is open source and features ongoing work by koush, cyanogen, PhilZ and many others.