Actually I know of or have been involved in developing some off-line web apps as some experimental programming projects. Tiddlywiki is a good example of off-line capable web applications, and there are many other based on this sort of technology. I recommend you have a look at http://tiddlyspot.com or http://www.yourformbuilder.com or http://yourtimesheets.com/ if you are looking for some examples that are out there already.
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Actually I know of or have been involved in developing some off-line web apps as some experimental programming projects. Tiddlywiki is a good example of off-line capable web applications, and there are many other based on this sort of technology. I recommend you have a look at http://tiddlyspot.com or http://www.yourformbuilder.com or http://yourtimesheets.com/ if you are looking for some examples that are out there already.