corporate brochureware, affiliate shilling, or narcissistic blogs?
And scholarly research and government resources and fanatic hobbyist sites.
I would venture to say that perhaps half the sites that I find the most useful and that I would miss the most are already ad-free.
- Dictionnaire de moyen francais, allowing full-text, regular expression searches? No ads
- The Core - no ads ;-)
The big exception - a true replacement for Google that does not have ads.