I once drove 10 hours to visit a friend but my phone was dead on arrival. I had his address but no apartment number. I used the Kindle experimental browser to message him on facebook.
I read HN on my Kindle's browser fairly regularly. HN itself (and similar pages with a simple layout, such as i.reddit.com) works great. For the articles that are linked, it's a coin flip whether it works or the page has so much cruft that it crashes the browser.
I used to use the built-in browser to load Google Voice and Google Talk and they worked fine. Of course, this was before they were overhauled into bloated, JS-heavy pages that barely run on non-Chrome mobile browsers.
You can write a proxy that creates a new page on Wikipedia with the requested URL. A remote machine then monitors the page, downloads the URL, and adds to a new Wikipedia page.