Terence Tao's course notes on linear algebra are freely downloadable on Open Math Notes.
Ebooks, Innovation, and the Rebel Within
AMS Associate Executive Director Robert Harington talks with Peter Krautzberger, Project Lead for MathJax and creator of AMS MathViewer, about his views on web publishing, ebooks, and mathematics on The Scholarly Kitchen.
AMS MathViewer -- Read Journal Articles on Any Device
Pushing Limits: From West Point to Berkeley & Beyond Ted Hill
Recounting the unique odyssey of a noted mathematician who overcame military hurdles at West Point, Army Ranger School, and the Vietnam War, this is the tale of an academic career as noteworthy for its offbeat adventures as for its teaching and research accomplishments.
Problems in Abstract Algebra A.R. Wadsworth
Intended for strong undergraduate and beginning graduate students that want to enrich their learning of mathematics, this book of problems in abstract algebra (groups, rings, linear algebra, fields, etc.) provides more variety and more challenging problems than most algebra textbooks and can be used as a course supplement or for self-study.