Minor rant here (sorry if this offends people). I find it very strange that in a time where people are really pushing for Rich Internet Applications with snappy desktop-app-like-response times, there is a good amount of purposeful slow-down being implemented. I am, of course, talking about things like the accordion effect, the fade in, the fade out, the slow drop down menu. Sometimes I get it; a slow movement helps associate an item with it's origin (you can see where it came from). But most of the time this is not required. Take a drop down menu for example; people understand the drop down menu paradigm, they don't need a slow movement to see where the menu came from - it came from the menu bar item they just hovered over. No clarification needed.
Granted, I am not a typical user. I love using keyboard short cuts. Maybe because I am web developer, this stuff (the web) just makes more sense to me - is more intuitive to me. I am not a huge window-shopper of web sites. If I am on a web site, I am looking for something specific. When I am on a mission, all tweening serves only to keep me from my destination.
So, that's my mini-rant for the day. Probably because of who I am and how I use the web, it makes my rant a moot point... but maybe it is something worth thinking about.