Various people I know have tried to set up local book exchanges, etc - but there are very few takers. I remember one starting up in Aberdeen, the idea being that you were meant to give a book to the person whose name you were given, then eventually you would get one back or something. I dutifully did mine, but I know that other people who were approached said a flat no - they only wanted new books from Amazon or wherever. Also, I recall that after I had given my book, a friend said 'Oh she will already have read that, OF COURSE' - which rather put me off the whole thing, as I clearly wasn't intellectual enough!
There is 'book crossing' in the UK and I imagine that also exists in the US. I've never done it but I'm interested - must look it up and see how it works.
I totally agree, nlhome, that ones tastes (in all things, not just books) change over the years. I've also found that lately I am not so attached to books as I once was - I don't mean reading them, still as attached to that, just not so fussed about keeping them, unless they are special or have special meaning for me. Maybe it's because we seem to be moving house so often lately.
Rosemary