Here are a few online resources that have helped me as a teacher and researcher.

Explore the Laboratory for Comparative Human Cognition site -the group has a mission of understanding the historical construction of human life. Links will take you to some extremely useful places - my favourite is the index of past issues of the LCHC newsletter where you can search for articles stored at the archive centre - all pdf articles and a little slow to download.

The "CHAT book", as it is commonly referred to, is an edited volume, officially titled
LEARNING FOR LIFE IN THE 21ST CENTURY: SOCIOCULTURAL PERSPECTIVES ON THE FUTURE OF EDUCATION, edited by Gordon Wells and Guy Claxton. A collection of papers spanning many disciplines, all centred on the problem of goals of education.

One of the most influential scholars in Activity Theory, Yrjo Engestrom, has allowed us access to a pivotal book of his,
Learning by Expanding: An Activity - Theoretical Approach to Developmental Research - unfortunately it's out of print, so this is the only place to access it if your library doesn't hold a copy.

An useful place to see what people are thinking about right now in terms of
socio-cultural theory and cultural-historical activity theory across many disciplines, is the XMCA discussion list (lerking is considered fine). Regular organised discussions and mini-courses are held here.

Online Readings in Psychology and Culture contains short chapters relating to many aspects of the interface between psychology and culture.

Forum: Qualitative Social Research is a multi-lingual online journal promoting discussion and cooperation across geographical and academic borders.

Robert de Beaugrande (recently disillusioned by the powerful discourses of knowledge production) has made his entire collection of work available.

Reading in a Foreign Language journal - an online refereed journal of issues in foreign language reading and literacy.

The systemics community around the world keeps in touch at
sys-fling.

The
Directory of Open Access Journals contains many free-access papers...hopefully this will grow exponentially.

Access dissertations and theses online is at the
NDLTD

The
Linguist List is a resource for those interested in language and language analysis; free and run by professors and graduate students.

The Journal of the Imagination in Language Learning is concerned with theoretical and practical relationships between the imagination and the acquisition of first and subsequent languages. Here's a listing of articles by author.

Networks - the first online journal of teacher research. Executive editor: Gordon Wells.