Sometime ago I wrote a small Greasemonkey script that adds 3 HTML input elements to the page I am viewing in Firefox, each containing the address of the current page and additional info in a different format: HTML, BBCode, and MediaWiki markup.
Read the rest of Copy URL+ extension for Firefox.
Note that your comment doesn't show up immediately. I review each comment before I add it to this site.
Check the Follow this page option if you want to receive an email each time a comment is posted to this page, including yours. A link to turn this option off will be included with each email.
Internet adresses will be converted automatically. You can use the following notation to specify anchor text for a link: [url=http://example.com/]example text[/url].