It was discussed a number of times here on HN a couple of years ago and the author is an active participant here. Please note that it isn't a very large index,

It was discussed a number of times here on HN a couple of years ago and the author is an active participant here. Please note that it isn't a very large index, but it shows what one single person can do today on spare time and until recently a hobbyist budget. It also very effectively shows that every dumb excuse Google tell us for putting spam on top and not respecting our queries are just that: dumb excuses.