You may be right. But my application requires it to be completely turnkey. Do you know if the WDTV box can be configured to jump to slideshow immediately upon power on?
Dunno. Maybe something even simpler, like this: http://www.satechi.net/index.php/new-products/satechi-cyclone-micro would work for your needs. Or something more hackable like the Patriot Box Office. http://www.patriotmemory.com/products/detailp.jsp?prodline=6&catid=69&prodgroupid=159&id=895
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