Persisting web pages locally

The usual model is a source serving pages, and the source persists the
data in various ways.

I am writing a note-taking (and other uses) application using GWT.
Properly, a lot of the smarts will reside on the server, but I must
make choices about persisting the information the user enters. The
primary entry is by handwriting.

It would be useful if the user could save in a format that displays
the writing even when opened on a machine that does not have the smart
server, keeping the notes visible, and embedded in an HTML document.
I am already experimenting with rendering the writing with PNG
images. I'm expecting to save the handwriting data as InkML, and
there may be other related information (such as the interpreted text).

Are there any approaches using GWT to allow me to save PNG images
along with a local copy of a page, so it's readable without the server
to interpret it? I would need to fetch the images from the server and
them write it all locally. I could have the server do this while
connected, or the browser (if that's practical), but I would like a
one-file format that could be opened in the browser on another machine
and show the writing/PNG.

Later I'm thinking of other content as well, so general pointers would
be helpful.

Thanks for any ideas,
bcw

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