I've seen embedded new synths in a number of pages today - blog posts, Channel 9, news articles, tumblr, et cetera.
What surprised me is that all of them simply played a video of the synth, rather than presenting the interactive synth, even though I was using the same browsers used to browse the Preview site.
In fact, the only place that I have seen an embedded new synth actually be interactive is on the Preview site's About page. http://photosynth.net/preview/about/
What is everyone else's experience?
Can anyone else point me to an embedded new synth that is interactive?