Hi folks, I just wanted to mention that rPath's rBuilder Online, http://www.rpath.com/rbuilder/ can now generate livecds with a completely customized package list completely on the web. It's free for open-source projects and it also supports other outputs like VMware player images, raw hard disk images, etc.
Disclaimer: I work for rPath. I do think that rBuilder is a pretty cool resource for anyone attempting to build a live CD.
I attempted to update the wiki with a link to rBuilder, but it looks like the registration form is down...