apt-get update gives failed to fetch error

I just installed Debian from http://cdimage.debian.org/cdimage/daily-builds/etch_d-i/beta1/amd64/iso-cd/debian-testing-amd64-netinst.iso and now want to update the list of packages because the image has only the basic set of packages.
I edited the /etc/apt/sources.list file and here is what it looks like now:
-----------------------------------------------start-------------
#deb cdrom:[Debian GNU/Linux testing _Etch_ - Official Snapshot amd64 Binary-1 (20051111)]/ etch contrib main

#deb cdrom:[Debian GNU/Linux testing _Etch_ - Official Snapshot amd64 Binary-1 (20051111)]/ etch contrib main

deb http://http.us.debian.org/debian stable main contrib non-free

deb http://security.debian.org/ stable/updates main contrib non-free
-----------------------------------------------end----------------

And when I run "apt-get update" I get:
+++++++++++++++++++++++++++++++++++++
...
Fetched 2B in 1s (1B/s)
Failed to fetch http://http.us.debian.org/debian/dists/stable/Release Unable to find expected entry main/binary-amd64/Packages in Meta-index file (malformed Release file?)
Reading package lists... Done
W: Couldn't stat source package list http://http.us.debian.org stable/main Packages (/var/lib/apt/lists/http.us.debian.org_debian_dists_stable_main_binary-amd64_Packages) - stat (2 No such file or directory)
W: Couldn't stat source package list http://http.us.debian.org stable/contrib Packages (/var/lib/apt/lists/http.us.debian.org_debian_dists_stable_main_binary-amd64_Packages) - stat (2 No such file or directory)
W: Couldn't stat source package list http://http.us.debian.org stable/non-free Packages (/var/lib/apt/lists/http.us.debian.org_debian_dists_stable_main_binary-amd64_Packages) - stat (2 No such file or directory)
W: You may want to run apt-get update to correct these problems
E: Some index files failes to download, they have been ignored, or old ones used instead.
+++++++++++++++++++++++++++++++++++++

Any clues?
Thanks,
Oz.