Thanks for the pointers, looking forward to browsing. As for money in the affiliate program, I have a small web site where I tested it, and I realized it sucks

Thanks for the pointers, looking forward to browsing. As for money in the affiliate program, I have a small web site where I tested it, and I realized it sucks: if somebody buys a book through my link, I get perhaps 1 to 3€ (Europe here). But only a tiny fraction of visitors clicks, and a tiny fraction of those buys anything. Meanwhile, every click on an Adsense ad gets me 10 to 50 cents... Adsense wins easily. The only times it seems to be effective is if people click on your Affiliate link and then go on to buy expensive stuff like iPods or TVs. A friend of mine told me he was making money for years because of a a comment on some discussion board recommending some cheap cable (forgot the details). People who bought the cable also bought other more expensive tech stuff... In any case he said the discussion board people have caught on and now insert their own links.