This plugin seeks to address certain shortcomings with WordPress’s default auto-hyperlinking function. This tweaks the pattern matching expressions to prevent inappropriate adjacent characters from becoming part of the link (such as a trailing period when a link ends a sentence, links that are parenthesized or braced, comma-separated, etc) and it prevents invalid text from becoming a mailto: link (i.e. smart@ss) or for invalid URIs (i.e. http://blah) from becoming links.
This plugin will recognize any protocol-specified URI (http|https|ftp|news)://, etc, as well as e-mail addresses. It also adds the new ability to recognize Class B domain references (i.e. “somesite.net”, not just domains prepended with “www.”) as valid links (i.e. “wordpress.org” would now get auto-hyperlinked)
Download this Plugin Free: http://coffee2code.com/wp-plugins/auto-hyperlink-urls/ (this url was converted to a clickable link by the AutoHyperLinks Plugin)