A couple of folks in the Community Server have posted about a nifty offering from the folks over at Snap.com: Snap Preview Everywhere.  It's a little gimmicky, but adds a nice touch to existing websites via just a couple of lines of javascript added to your header.  I only have 2 complaints (if you can even call them that): I wish there was an option to specify the dimensions of the snap preview window (it's tiny on my 1600x1200 monitor), and an option to open links to external sites in a new window (there is an option to disable snap previews on internal links to your own site, read the FAQ for more information), or even better honor the underlying link's target attribute...as of now all links open in the same window regardless of the target value.

There are more detailed instructions located here.

Is this a permanent addition to JK.com?  We'll see.  So far I like it.