We previously reported on a method for storing an entire set of HTML in a bookmark on the iPhone (in effect allowing "Web apps" to live locally on the device) by utilizing the data: URL. All page content is stored in bookmark data, and can be accessed when no network connection exists â?? even if the iPhone is in Airplane mode.
The current implementation is not without some flaws and limits; it looks like the iPhone has a ~32KB size limit for bookmark data storage, so pages larger than that may not store properly. Also, some current iPhone-designed Web apps render improperly on don't function when put through the conversion process.
"Storing a couple of these in your bookmarks slows down bookmark editing in Safari. [...] Don't point it at your favorite MySpace or news page. Those sites are way too big. You'll want to stick to widgets and iPhone web applications, preferably with minimal graphics."
Give it a shot on your iPhone and let us know your results.