Here are some links to resources on language and linguistics on the web.

For the language enthusiast, the linguist, start with the great web site: Ethnologue.

Check the Overview, as well as Languages of special interests which includes Pidgin languages, Creole languages, and Deaf languages.

Then delve right into Language Families where you can see which language is related to which. From there, you can explore each language, the number of speakers, which countries is it spoken in, and much more.

The free web encyclopedia, Wikipedia, has a collection of Linguistics based topics.

Another web site, Zompist.com has a section on linguistics, with lots of nice research.

Do not confuse languages (which is a spoken set of syntax, semantics, grammar, ...etc.) with writing systems.