Tony Hirst, of the OpenUniveristy, wrote to tell me of this tool that he and a couple of his colleagues put together recently.
It's a simple bookmarklet powered tool that lets you splash the URL of the page you're currently viewing in a browser as a large font minified URL or QR code, so that audience members can easily write down/visit the URL
You just need to try it out; it's great!
Find out more about it here: