If you're one of the multitude of people that read this blog, you'll probably noticed I stopped building recovery images.
Instead, I've been doing builds (roughly daily) and then running an update server for a few hours.
So, if you're running my 64-bit kernel Cr-48 build, you may get an update pushed out if you check under "About Chromium OS". (It looks like some of you have already figured this out! :-)
I've been running the 64-bit kernel for about a week now without issues. Let me know how it works for you.