Mintel (http://hdl.library.upenn.edu/1017/13269 )
Simmons OneView (http://hdl.library.upenn.edu/1017/106498 )
eMarketer (http://hdl.library.upenn.edu/1017/6901 )
Passport GMID (http://hdl.library.upenn.edu/1017/6908 )
Market Share Reporter (http://hdl.library.upenn.edu/1017/77507 ): This is a searchable ebook that aggregates market share stats.
Business Source Complete (http://hdl.library.upenn.edu/1017/88405 ): This is primarily a database for academic, trade and news articles.
Marketresearch.com Academic (http://hdl.library.upenn.edu/1017/28431)
The Entertainment Software Association (http://www.theesa.com/ ) is also a good resource.
Five Thirty Eight - data/statistical stories about elections, politics, sports, science