Those of you, like me, who suspect the garritan choir is still well to the back of the queue, and would like an interim solution that doesn't cost a fortune while we patiently wait, may like to check this out - http://www.papelmedia.de/english/produkte/index.htm. It is a German choir that comes with three soloists (the soprano reaches down to the alto range as well, as is superbly looped, plus tenor and bass). The library is 300 MB and throws in a few sampled instruments as well, including mercifully, a guitar. Price? Would you believe 39 euros? That is 28 pounds sterling and about 50 US dollars. I knew the economy in Germany was going through a bad patch. But it is an ill wind etc....
You have to have an AKAI, EXS24, HALion, WAV, AIFF. compatible sampler to play them, but they work and the sounds are pretty good. They come from the Peter Siedlaczek Classical Choir and Hallelujah Gospel Choir libraries. It is a sort of a "best of" collection. It is limited, compared to the full ones, but it does the trick. The limitations are they are sampled to only two octaves, and don't contain all the consonants of the full version.
Before I got Kontakt 2, which will open it up, I couldn't use it, so I decided to mess with the raw WAV files anyway. I composed a little piece by "assembling" them in Tracktion - including some of the consonants and formed nonsense words.
It isn't a great piece of art or anything - just a test, but it shows that the quality isn't bad.
Interesting background information, thanks. I am playing it with the sfz free sampler which does the trick. I will certainly explore your other links, you can't have too many colours in the palette, at that price anyway.