Thal and Alistair, please can we stop? I know Thal is a wonderful source for hard-to-find scores and that there is no-one in the world with quite a collection like his. His sense of humour is also wonderful - I laugh at nearly every post (even when I shouldn't, really!). I also know that Alistair provides a wonderful service for information about Sorabji (he's had some of the most wonderful experiences and presences at live events) and scores of sheet music, in humongous A3 (which I have to say surprised me when it arrived in the post!).
Gamingforce is good to download and have a play through pieces, but really you cannot work from a print-off. Then you buy the real score (unless of course it's so rare you can't - I'm still looking for that damned Antheil Jazz Sonata).
The service which Gamingforce provides is very important for me, because it allows me to evaluate the "playability" of the music. I mean, I can't just go and learn Vingt Regards No. 1 as easily as Gluck-Sgambati Melody. Seeing the score helps to evaluate a piece.
Tom