Howdy - WordPress Snap has been an awesome plugin so far - I've implemented it with some tweaks on WordPress Multisite 3.3.2 and used it to populate the website thumbnails as part of a user registration system/display. I added their web sites with a custom user meta field and called that field with a user loop on one of my page templates.
When I upgraded to 3.4 though, some of the thumbs changed (to screenshots of websites that weren't even related or that I've ever seen before), others disappeared, and when I add a new users, the thumbnail doesn't show up at all. Alas, I've reverted to 3.3.2 which left some of the previous thumbnails messed up but seems to work for new ones again. I really hope the author updates the plugin so I can keep taking it with me to future WordPress versions.
Thanks so far though - great plugin!