The British Library at one stroke

I've just been trying out Microsoft's newly launched Live Search Books. It's impressive - based largely on books scanned in from the British Library. Books are available for free download, in their entirety, and searchable by keywords which come up handily highlighted. Results don't seem particularly printable, but even so it is a valuable research tool.
I started with some real excitement - this revolutionary technique just in time as I push by J. S. Haldane biography through to its conclusion. With some relief, however, very little came up which I did not know about beforehand - a chapter by William James considering his work, and a few extra snippets about his time in a youth in the German university town of Jena.
It's a taste of things to come though, when so much initial research will be done from a home computer. I'm waiting to see how Microsoft makes money from it all.