Zero Install

http://zero-install.sourceforge.net/

"The Zero Install system makes software installation not merely easy,
but unnecessary.  Users run their applications directly from the
internet via the software author's pages.  Caching makes this as fast as
running a normal application after the first time, and allows off-line
use." It's basically a lazily populated filesystem interface (Linux
only) to HTTP.  (Submitted by Martin Pool.)
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