Logos bible software have just produced a website called ref.ly that provides a URL shortening service for scriptures. This then links directly to the online logos bible. This may not be much use for many people but for anyone writing a Christian website it could be particularly useful.
What sets ref.ly apart from the crowd is that it works on a wide variety of different abbreviations which means it should be easy to use. Also of course it is a very short URL which makes it great for services like twitter or facebook. They provide an example of the various ways you could link to Matthew 11:25–26