A launch date for Canon's new replacement for its 30D digital SLR has been set, or has it? This weekend, Amazon.com posted information on the new model 40D stating that the camera would be going on sale on September 20. But apparently the posting was premature, as the Nettailer quickly sacked the page containing the 40D news, but not before Keith Cooper sucked it down and re-posted it at his Northlight Images site.