Scientific Linux 5.1 x86_64 is now officially released and available.  The DVD 
iso image is being tested before being uploaded, but should be up in the iso 
area soon.


http://ftp.scientificlinux.org/linux/scientific/51/iso/x86_64/
ftp://ftp.scientificlinux.org/linux/scientific/51/iso/x86_64/

CD images are still being built.

-Connie Sieh
-Troy Dawson