The following are some good examples of posters with an
interesting layout.
Click on the images for a larger version.
The layout is self-referential. The work describes the use of
Voronoi diagrams
for vote districting, and the poster layout follows the same scheme.
This poster won the conference's best poster award.
(EURO XX 2004)
(MSAD 2004)
This slide (although a bit crowded) uses numbering and nested
layouts to guide the reading order.
(ICSE 2006)