My 'tell me later when this web site is available' server l8tr.org got an upgrade today. There are three things that are officially being released:
1. There's a l8tr.org bookmarklet which you can drag and drop to your toolbar. Just monitor a URL with l8tr.org and you'll be offered the bookmark customized to your email address. (Thanks for Iain Wallace for the code).
2. There's a l8tr.org Firefox extension that makes using l8tr.org a breeze. It's on the main l8tr.org page: click it to install it. Once configured with your email address a simply right-click on a link you want to monitor gives the option Monitor with l8tr. Click that and l8tr.org starts monitoring the link. (Thanks to Barrett for the code; he gets the $50 bounty).
3. l8tr.org's cache is now working. As well as checking to whether a site is available, l8tr.org caches the site's content and offers users both the original URL and the cached version.
In addition much has happened behind the scenes to make sure that site availability is correctly recognized.