These ISO files are published automatically once a new snapshot finished.
They haven't seen any kind of testing before publishing, so download on your
own risk and cost.

Most of the time they work, but there are times when they are broken - we try
to 
update http://en.opensuse.org/Factory/Status as soon as we know about that.

So visit (and edit if you reported a bug severe enough)
http://en.opensuse.org/Factory/Status first.