If you look at a kickstart generated from the satellite, it uses --url !http://HOSTNAME/ty/FkpH3KcN. This is used by spacewalk to track a particular kickstart session. These tiny urls are time based and expire after several hours. If you want to access the kickstart tree directly, simply use this url:

http://<spacewalk-hostname>/kickstart/dist/<ks-tree-label>

so for example, if my spacewalk server is "spacewalk.example.com" and my kickstart tree label (that I specified in the instructions above) is "fedora-9-i386", I would use: !http://spacewalk.example.com/kickstart/dist/fedora-9-i386 to access the full kickstart tree.

Please note: the kickstart trees are not browsable from the web UI. If you just put that url in your web browser you'll get a 404 since it isn't browsable. However, if you add a file that is in the tree, you should be able to download it. Example: !http://spacewalk.example.com/kickstart/dist/fedora-9-i386/GPL would allow you to download the GPL file that is in the kickstart tree.