The World Atlas of Language Structures (WALS) is a large database of structural (phonological, grammatical, lexical) properties of languages gathered from descriptive materials (such as reference grammars) by a team of 55 authors (many of them the leading authorities on the subject). The features are displayed in maps and exp-lained in short articles.

TLA-team: This is an information system with lots of typological information about many languages in the world augmented with a geographic access option. A great resource for people looking for information about the charateristics of the languages.