Web resources for Linguistics 101

The Field of Linguistics -- An Overview: A basic introduction to the field, from the Linguistic Society of America
Ask a Linguist: Might as well ask me, while you're here, but this is a useful resource. You might enjoy browsing through other questions & answers.
Ancient Scripts of the World: This is a really spiffy site!
A Web of On-line Grammars: Information about all kinds of languages
Counting Eskimo words for snow: A citizen's guide: You've heard the story of the amazing Eskimos and their 200 (or whatever) different words for snow. Now read the truth.
The Human Languages Page: Check the Languages & Literatures page.
Ethnologue: The Summer Institute of Linguistics' Ethnologue--the most comprehensive list there is of the world's living languages.
Language & Language Family Information: From The Linguist List, the Web's most useful resource for linguistics, and the home of Ask a Linguist.
Sources of Regional Data: Another Linguist List page, arranged by region.

Web resources for Linguistics 211: My 211 links page. Lots of sources for info on particular languages and language families.
The Yamada Center: The Yamada Center's list of language links
WWW resources for individual languages: A page from the Oxford Univerity Language Centre site.