Rafe Colburn, also on the "-1 Snap Previews" bandwagon, got some interesting commentary on a blog post regarding the issue, including how end users can opt out of the previews and a couple of other strategies for defeating the pesky popups. Apparently, it's a bit trickier for publishers though.
Also serves to remind me to subscribe to the rc3 webfeed.
[Via Scripting News]