That will IMMEDIATELY get my attention, as I'm basically looking for someone who loves -- or at least likes -- to code. It's worth mentioning that the majority of applicants I see do NOT have any side projects, and so basically fade into the background. I'll also usually ask for code samples as well.
Obviously, it would be great if any side projects were relevant to the job being applied for, but this does not have to be the case, particularly for less senior positions.
Hope that helps