The 3rd best post was by Benjulmag.
Well - since at least a few people here liked my post - let me hijack this thread for a moment and plug the Pictorial History Committee photo analysis newsletter that I write for SABR. It's called "Mystery Photo" for internal historical reasons - but that name really doesn't fit. It's all about
rational photo analysis
They are all available for download, starting with the April 2008 issue, for exactly $0 each (I guess it would be a better deal if I paid people to download it).
The first few issues were weak - but I think it's gotten better over time (at least longer and more controversial). The May 2009 issue was devoted to photo auctions. So if you have nothing better to do, here they are from newest to oldest:
http://www.sabr.org/cmsFiles/Files/Mysteryphoto5-10.pdf
http://www.sabr.org/cmsFiles/Files/Mysteryphoto1-10.pdf
http://www.sabr.org/cmsFiles/Files/Mysteryphoto9-09.pdf
http://www.sabr.org/cmsFiles/Files/Mysteryphoto5-09.pdf
http://www.sabr.org/cmsFiles/Files/mysteryphoto2-09.pdf
http://www.sabr.org/cmsFiles/Files/Mysteryphoto9-08.pdf
http://www.sabr.org/cmsFiles/Files/M...ublication.pdf
http://www.sabr.org/cmsFiles/Files/F...otoColumn1.pdf