Good article. When I applied to join XWiki, almost 7 years ago, I still remember how passionate I was about wikis and their potential to change the way people communicate and work together for the better. I'm fairly certain this was easy to see for my interviewers. So this article rings very much home:
Although many job interview books and articles focus on technical questions, they typically at least touch upon the importance of dress, communication skills, general people skills, and likability. However, there's one aspect that seems rarely discussed relative to its importance: passion.
To this day, I'm still surprised by the low number of passionate applications we receive. If I have but one piece of advice: thoroughly research which companies you should apply to, and craft a passionate and unique letter to each of them. If they're human-sized (as opposed to process-bloated), they'll react very positively.