64-bit Linux emulation status?

[John Nielsen]

Sorry if this information is already available, but I couldn't find it in the 
archives or on Google.

What is the status of 64-bit Linux emulation on amd64? Has anything been 
committed to the tree? Any news since this post?
http://lists.freebsd.org/pipermail/freebsd-emulation/2009-
January/005614.html

If it's still in the testing stages, what (if any) is a good test target?

Thanks,

JN