I just thought I would add a quick point that helped me to put things in perspective when I was waiting to hear from casting - a good friend of mine's good friend (who I've also met quite a few times) recently found out she did not make the Olympic squad for her sport. She competed in Beijing and gave up her job 4 years ago to focus on her sport and on competing in London 2012, and was a key part of the squad right until the (almost) last moment. I can't begin to imagine how devastating that would be - she really should have been in it (part of the reason why she missed out was due to recent illness), and to have worked so incredibly hard for the last 4 years (and of course in the years previously) only to miss out on being in your home Olympics must be heartbreaking.
So for the reserves out there, it's so disappointing not to be cast at this stage (I certainly know the feeling), but it might help to imagine if you were in my friend's position, and how much worse that would probably feel. I'm certainly not trying to belittle anyone's disappointment, just thought it might help, as it helped me to put things in perspective a bit.
(and in relation to the last few posts and the slightly strained atmosphere, this absolutely isn't directed at anyone in particular, it just occured to me just now to share).