If you manage a laboratory-full of linux computers, then you may find this little utility heaven-sent specially if you do not have unlimited bandwidth. :) Imagine how much bandwidth those computers will eat up when you try to update the packages.
IN my case, it is almost always necessary to either cache or mirror the Ubuntu repositories but that means getting those applications or packages that I do not really need. It is a good thing that I have found APTonCD, a little tool that allows you to save your package downloads to a CD/DVD, making it easy to share it with other computers. What is even easier is the fact that you can just distribute the ISOs, no need to burn 'em to disks! How do you use it? Here's how.
Now, if only the folks managing our Linux lab manage to find this entry, then we'd be saving wasted traffic during updates.