Here are some salient resources for appropriate technology open source information:

Large list of downloadable books - http://www.fastonline.org/CD3WD_40/CD3WD/INDEX.HTM
How to Make Everything - http://www.howtomakeeverything.com/CD3WD/INDEX.HTM
Honeybee Network - http://nifindia.org
Village Earth's AT Library
Appropedia
Openfarmtech.org
Soil and Health Library

Books

AT Library