When you copy the URL of a NING forum topic and paste it into the inspector tag of an image in Keynote, the URL gets transformed to this:
If you copy the URL into Keynote, paste, and then open it up in the inspector, it does not get transformed and looks like this:
That link works, while the first link does not IN Keynote. I'm still looking into it. Seems erratic. Maybe it's me.
Note: Forum Topic - Suggest a Theme for a Blog.