Ask HN: Value of a second MS?

As is the case with many students, I am currently approaching the end of my undergraduate education and I am faced with a decision about what to do next. I am in the unusual position, however, of having blown through my coursework quickly enough to finish a 5 year combined BS/MS program in Electrical Engineering in my first 4 years of college meaning my undergraduate scholarships pay for my master's degree and make it, essentially, free.

I am interested in applying to a different graduate school when I graduate - I think there's still a lot of really interesting things for me to learn and a lot of really exciting programs out there. However, I don't feel like I necessarily want to get a PhD, and I am unsure what my other options are.

How much utility is there in getting a second MS in a related technical field, given that I'll already have earned one? Is this done often or at all?