I have a new and insanely great idea which I will try implementing tomorrow. Basically, its going to be a bookmarklet and clicking it will parse the page and extract all the files used, generate a HTML5 Cache Manifest, encode it as a Data URL and open up a iframe or window with the manifest parameter set and then the site will be cached for offline!
Actually, this looks technically impossible. That sucks. Same Origin rules suck.
Es muy buena idea.
Intenté algo parecido con PHP, extrayendo imágenes de google.
Funcionó hasta que por motivos de seguridad, quebró
http://aamap.110mb.com/travel/
Great idea, actually I always wanted to do that myself, and I will probably keep saying that for a while :p