Update : v1.1 <font color="red">22/10/2012</font> : possibility to save images.
You can now save Image on disk ! You provide a base64 string of the image, and you can save it ondisk.
As an example, I'm taking a snapshot from the webcam, and saving the image :
<img src="https://dl.dropbox.com/u/1412774/SaveImageDemo/demo.png" border="0">
The demo : https://dl.dropbox.com/u/1412774/SaveImageDemo/index.html.
The plugin : https://dl.dropbox.com/u/1412774/SaveImageDemo/pode_filesaver.1.1.zip
The .capx : https://dl.dropbox.com/u/1412774/SaveImageDemo/SaveImageDemo.capx
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Something long waited for : the possibility to save files on local filesystem !
<img src="http://dl.dropbox.com/u/1412774/FileSaveDemo/demo.png" border="0">
I used the FileSaver.js shim to make the plugin works crossplatform (https://github.com/eligrey/FileSaver.js). It should works with relatively new browser, but not necessarily cutting edge.
For the browsers that don't implement yet the FileSystem HTML5 API, the plugin at least open a new window with the right url set (base64, xml, and so on) to let you do a "right-click | Save as"...
For the moment, you can save text file and HTML strings as html files.
The demo : http://dl.dropbox.com/u/1412774/FileSaveDemo/FileSaverDemo.capx.
The plugin : http://dl.dropbox.com/u/1412774/FileSaveDemo/pode_filesaver.0.1.zip
Planned for next version : save images and save binary blobs...
Edit : cleaned a bit my botched english...