The Identity Theft Resource Center (ITRC) is a nonprofit organization that focuses on educating consumers, corporations, government agencies and other organizations on best practices related to fraud and identity theft detection, reduction and mitigation.

Additionally, the organization does an excellent job of indexing and documenting data breaches as well! ITRC’s 2015 year-end report indexed 781 breaches, with each being categorized by industry and location, as well as the number of records exposed as a result of each breach.

The ITRC’s Breach List also gives a short description of the events surrounding each breach. This list gives the information security professional an idea of trends and common control failures occurring across the industry and serves as a great opportunity to self-assess.

2016-01-13 17_26_12-ITRCBreachReport2015.pdf

Check out their 2015 Data Breach reports here.
Subscribe to their 2016 breach update mailing list here.

Save other great links to resources in the comments.