Snap Web Classic - Is the traditional search engine result page (10 blue links) but with Snap Shots enabled. Now you can decide how you prefer viewing the search results. If you like preview and find them useful you could switch to Web Enhanced which is more innovative in terms of previewing results and which also supports keyboard up and down arrows etc.
RSS Shot – When a link to a site has a RSS feed, instead of a PreviewShot it will show the headlines & excerpts of the latest stories. This should increase the engagement of your readers. The RSS Shot feature isn't enabled yet for all Snap users but it should be fully released in the near future. I noticed this on some blogs and it's very useful but now there isn't a way to have a quick PreviewShot. Maybe they should add a PreviewShot tab in the bubble.
Video Shot and Photo Shot - Now supports all major video and photo sharing sites (YouTube, Metacafe, Google Video, Xanga Video, Revver, PhotoBucket, Flickr, PicasaWeb…)
A zoom feature was added-look for the little magnifier glass at the top right corner of the bubble.
Related Searches - Those will be displayed instead of the search box and should provide users with suggestions to searches that are related to the site being previewed. The "related searches" feature is not fully released and can be spotted on some blogs.
According to VP Product Jay Meydad, additional types of Snap Shots will be released soon. Stay tuned.