I was cruising Alpesh's blog and as I moused over a link I saw a preview of the page.

THIS IS AWESOME!

So I checked it out and it was using Snap Preview anywhere - firstly - kudos on the domain name - www.snap.com - secondly - AWESOME TOOL!

Sign up - its free.

and Yes - you probably could just embed this in the header of your MOSS 2007 website however I add this disclaimer - I haven't fully tested this so I'm not sure if any of the JavaScript breaks MOSS 2007.