Check out this post on a file manager being included in the iPod 4 operating system.
This is exciting news, as the iPod, iPhone, and iPad could really use a global file/folder space. Right now, it seems like each application is sort of self contained. It would be nice to be able to share HTML files and the like. It will be interesting to see how this work and how applications will interact with it. If its included in the final version. :)