From Keir:
New releases in the 3.3 and 3.4 stable branches are now tagged and released.
You can pick up the source repositories here:
http://xenbits.xensource.com/xen-3.3-testing.hg (tagged RELEASE-3.3.2)
http://xenbits.xensource.com/xen-3.4-testing.hg (tagged RELEASE-3.4.1)
Or you can pick up tarballs from the following webpages:
3.3.2: http://www.xen.org/download/index_3.3.2.html
3.4.1: http://www.xen.org/download/