UbuntuHelp:RsyncCdImage
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rsync is a wonderful piece of software that only downloads the parts of a file that have changed. https://launchpad.net/products/rsync is a good resource for more information.
A nice thing about the way the Ubuntu CDs are constructed is that it's quite easy to keep an up to date local install CD using rsync. Since the daily CDs generally change quite little, it can be processed quite quickly.
Acquiring the ISO
The various files that you need are at http://cdimage.ubuntu.com It's best to use the torrent file if you can.
If you have a local Ubuntu archive mirror or cache, you can also use Jigdo. Rsync is handy for finishing up Jigdo downloads that still have a few missing pieces.
Updating the ISO
A number of the Ubuntu servers also work as rsync servers with quite similar URIs to the websites. For example:
rsync -zhhP rsync://cdimage.ubuntu.com/cdimage/daily-live/current/feisty-desktop-i386.iso .
will sync the server's daily Feisty desktop image (for i386) to your local system with an older desktop image already stored on your hard drive. -z is compression, -hh is human readable file size, and -P is a progress indicator.
