Eleanor Dickson et al. have self-archived "HathiTrust Research Center User Requirements Study White Paper ."
Here's an excerpt:
This paper presents findings from an investigation into trends and practices in humanities and social sciences research that incorporates text data mining. As affiliates of the HathiTrust Research Center (HTRC), the purpose of our study was to illuminate researcher needs and expectations for text data, tools, and training for text mining in order to better understand our current and potential user community. Results of our study have and will continue to inform development of HTRC tools and services for computational text analysis.