The Brown University Library has made a licensed version of the PDF ebook The Collected Works of Mahatma Gandhi available on the web. It is a downloadable ZIP file, approximately 80MB.
http://library.brown.edu/eresources/restr/complete_works_Gandhi.pdf.zip
This file is restricted to download by Brown users only. If you have questions or issues with this download, please send an email to eresources@brown.edu for assistance.
A publicly available version of this work is separated into 98 individual volumes, and can be accessed by anyone at:
http://www.gandhiserve.org/e/cwmg/cwmg.htm