Subtle Flash

The Holocaust Museum site is a wonder of sophistication, with many elements cited on David Armano's blog.
It's uncluttered, understated, subdued, intuitive. It also conveys emotion, using the "people like me" principle so important in storytelling. "Daniel's Story," just a two-word title on one part of the site, reminds me that I know a young Daniel, and makes me want to click further to be told a story.
The site also uses subtle Flash. We have a visceral response to motion, no matter how small, and the moving Flash element for feedback, visible in a Firefox browser at the bottom right, catches my eye. Brackets move back and forth, and a plus sign changes to a minus sign, back and forth. It's a small movement in my web peripheral vision, and while there's other motion on the page, it's enough to grab me and send me to that part of the site even though it's in the "ghetto" part of the page according to Eyetrack research.
A fine use of Flash. Not flashy at all.
It's not visible in my ancient Explorer 5.2 for Mac, but the site then detects my use of outdated software and provides a link on "How to use this site" with more details underneath. Smart.