I really don't think you are going to find a LiveCD that just pops up with Samba and a web based configuration application (beyond Swat, which doesn't sound like what you want exactly).
If you want to set it up well, and have it reliable, you have to do the work and configure it yourself. But it really isn't hard, Samba's configuration is pretty simple, and you can find hundreds of example configurations online you can use. Depending on the distribution, it is likely to have a pretty complete example file included by default.
Of course, that is just Samba. If you want to support Linux machines, you should really use NFS too. While you can certainly use only Samba (and I did myself on my own file server), it is much easier to use NFS. It took more playing around with Samba on the Linux client end than on the server for me to get it to work properly (mount with proper permissions, large file support, secure handling of passwords, etc).