Shag: I agree with Heath. On the old site and every other forum I participate on I can type:
http://www.blah.com/coolpic.jpg
and it will automatically "be" a link that someone can click on. And when they click on it, it opens a new window. But whatever. It's not like any of us HAVE to pay to participate on this forum. But still, we should probably speak our mind and say what bugs us about it.
I fixed your link so that it opens in it's own window. Stevo was trying to explain how to do this, it's all in how you post it. No it's not automatic, but it can be done. But if the original poster doesn't actually make that line a link by clicking on the link button while composing the post (or if I happen to wander by and fix it), then it will just be like any other line of type.
Since your link was a made up one, here is a real link to show you it works.
http://sangathor.com/photos/warrior/images/87/original.aspx
Or you can take it a step further and not even display the link and make some normal text a clickable link like this:
Smoke a Fatty
Maybe Carknee can make opening links in a new window the default setting, maybe he can't. If you want him to consider it, you will have to ask in the new forum feature requests topic.