This browser developed by Todd Ditchendorf an ex apple engineer. The main interesting spec is the use of the cover flow view to view the links of a web page or to view photos. Is interesting that cover flow is showed like a finder window not as new window like CoolIris.
Here a video demostration of the browser:
Fluid Thumbnail Plug-in | http://fluidapp.com from Todd Ditchendorf on Vimeo.
Download is not yet available.