I have often thought about downloading all the apps on the site, and putting them on disk in case they are needed anytime. I have older versions of some of the apps, and I am using them in this way, and they have often proved useful, especially if I need quick acess to a file and I am unable to download an alternative pogram.
A method of downloading (or perhaps torrenting) all the Portable apps at once would be most useful for this situation, and others similar to it. I am not fortunate enough to have the time to run every download seperately, and so this would be a feature that would be really useful.