Along with Google Suggest and Google Instant, The big G has also rolled uot a niche service that displays a website screenshot when you mouse over a listing i.e.

google instant preview
How long before the marketing bods (and SEO’s for that matter) realise this is great for point of sale and through the use of large banner graphics where the test is still legible in the preview. Just imagine browsing the preview panels looking for a great deal on a blue widget without even clicking into a site… could this be the next big thing in SEO?

I am sure this will change the way you want to present your site. I do not think it is going to change the seo part of the work.
Thank you for a great site :-)
This is certainly interesting! It certainly should make you consider the graphic layout of your site, and how this instant preview could help attracting visitors. I guess you could call it a “grapich meta description tag” :-)
Will it harm the sites who have a slow page-load rate??? I hope not so. Otherwise This one is great feature introduced by big G. Other search engine Might follow this soon.