Websites of practical use

The Anomalocaris Homepage
http://www.trilobites.info/anohome.html
Information about various anomalocarid species.

David J. Peterson's Web Thing
http://dedalvs.conlang.org/
Provides numerous constructed language examples; interesting as art and instructive for language construction.

Grammar of the Novegradian Language
http://www.veche.net/novegradian/index.html
Among the most horrifyingly well-developed constructed languages found online.

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Useful projects

Galaxy Zoo
http://www.galaxyzoo.org/
A website allowing one to participate in galaxy classification and other crowdsourced scientific endeavours from one's computer.

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Wikimedia Contributions
http://en.wiktionary.org/wiki/Special:Contributions/Vorziblix
http://en.wikibooks.org/wiki/Special:Contributions/Vorziblix
http://wikisource.org/wiki/Special:Contributions/Vorziblix
http://en.wikipedia.org/wiki/Special:Contributions/Vorziblix

A more complete list of links
http://www.stumbleupon.com/stumbler/Vorziblix/all/?grid