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Why don't more distros use this method?
(www.virtualizationhowto.com)
It's very nice to not have a dozen different versions of the same distro to parse through and figure out that are simply the same distro with a different DE. Moreover, very few of them offer this many options.
Cachy could be doing a better job explaining what the user is looking at here and who each of these is for. Pretty easy to sum up in 1-2 sentences...
Debian has this (well, for sources at least) and I think it's somewhere between 20-30 DVD images for actually-everything. Maybe not something for the day-to-day but great to keep on hand for preppers and the paranoid (: