I just added a cool little plug-in that provides previews for external links. The service is provided by snap and using the Snap Preview Anywhere Plugin for WordPress, I get the preview automatically added to any link that goes outside of this blog. I tried to make it less obtrusive by using an icon just after the link that when you hover over will pop-up the preview. The normal text link acts as normal.
You are supposed to be able to disable it in the options of the pop-up if you don’t like it. If you experience any problems, please let me know.