The wonderful World of Richard Dawkins. Dawkins is one of todays best known evolution theorists, and this unofficial homepage (it is not the homepage of Dawkins himself) has a lot of material about Dawkins and about natural selection, about his controverse with Stephen Jay Gould and with the creationists, and you can breed your own biomorphs.

Eric Weisstein and his dicionary of mathematical subjects called MathWorld. After some copyright-struggle, the page is now back again, alive and well.
Mathematica also supports an Integrator that integrates functions online.

The official list of unicode characters (I love it: all those strange symbols).

The KnotPlot Site about mathematical knots, with many images and a program for visualizing, constructing and relaxing knots.

Heartless Bitches International has some nice pages, like "Things that make us want to Lose Our Lunches" or a list of remarkable women.

Siemens developed a very useful program, Web Washer, being able to filter commercial adds on web pages. Best of all: for private users (and educational institutions), it's free. It can be found on their homepage, it takes 5 minutes for installation, it can filter banners and prevent pop-up windows.

We have here a game Find the spam.

And we have a site with some fascinating animated fractals.

For all capable to speak German, hier ist eine katholische Ohrenbeichte.

And of course there is a link to Germanys most kinky party, the F.D.P.

And for all your secrets, Romana waits for you with stego.
Also take a look at PGP.

Robert Fripp and King Crimson are also in the net and wait for some Elephant Talk.

An Implementation of Conway's Game of Life. More information about this game, with links to implementations and other ressources.

The official Siedler von Catan homepage.

There is also a site with links of pages about chastity belts.

If chastity belts are not your kind of kink, maybe you can find what you search at Greenguy Link-O-Rama.

If you are willing to read books on a screen instead of on paper, or if you are willing to print hundreds of pages, well here are some links for you:
Athena has a large list of links of online-documents, from Lautréamont over the Arabian Nights to a list of the first few digits of pi. If you are searching a book online, look here first.
Perseus has many English/Greek files, but maybe you should visit their Help Page first.

A (german) page about HTML, Frames, Javascript, Style-Sheets &c.: SELFHTML (very good, very up-to-date).

An english page with CGI scipts: Matt's Script Archive.

All about Anime&Mangas: Otaku World! (Pictures, KiSS, Games, Tools, &c.).

If you are traveling in Germany: Deutsche Bahn AG Fahrplanauskunft.

"No, no, I do not want to leave this site, I want to stay with you"