A theme with a simplistic black & white design. Of particular interest to me is the stationary nav menu in the upper left. No matter how far down you scroll, it's always there.

A clean theme with a drop down menu, threaded comments and options.

Thematic is a free, open-source, highly extensible, search-engine optimized WordPress Theme Framework featuring 13 widget-ready areas, grid-based layout samples, styling for popular plugins, and a whole community behind it.

Is it? Read Tom Arah's post along with a nice follow-up post (featuring a chat with Adobe) to see if you agree.

A jQuery powered accordion content script. Group contents together and reveal them on demand when the user clicks on headers.