Mai worked for Goldman Sachs in London for many years as an investment banking associate. When she was at LSE, her seniors used to pass her notes of their interviews as well as their cover letters, which helped her tremendously in her job search. This site is a way for her to pay it forward, obtaining qualified materials from her friends and contributors, and building a similar community to pass the resources on to you.
Your website definitely helped me, providing many nice samples of successful cover letters, and giving me ample ideas on how best to demonstrate my skills and experience in the limited word count. Those skills boosted my cover letter significantly, and earned me internships at RBC for the past 2 summers now.