The CSA database provides summary info. about the origin of language, entitled Language Origins:
Did Language Evolve Like the Vertebrate Eye, or Was It More Like Bird Feathers?. Includes a several page summary, citations, web sites, and a glossary.
In related news, Hampshire just subscribed to LLBA (Linguistics and Language Behavior Abstracts), which offers citations to linguistics articles from 1973 to present. CSA provides detailed info. about LLBA as well.