According to a (slightly old) article from Lifehacker, shameless self-promotion can be a good thing: http://lifehacker.com/5899349/shameless-self+promotion-is-a-good-thing-in-job-interviews.
The article isn’t long, and mainly refers back to the original data, which was published in the Journal of Applied Sociology. Here’s a little bit:
“New research published in the Journal of Applied Social Psychology suggests that an abundance of self-love might just be the key to impressing interviewers. In most social settings it’s generally frowned upon to say a bunch of nice things about yourself, but in job interviews it’s not just expected, it can help you nail down the job. Most people tend to back down their self-love when they’re challenged by an interviewer, but narcissists actually ramp it up a bit.”
…and apparently, it works. Something to think about.
As one commenter pointed out, it’s important to find the balance between, as they put it “self promotion and coming across as an arrogant DB.” I’d rather not do the latter.