Wow! I don't mean this in a demeaning way, but my tiny city that's pretty "old-school" in tech choices (Brisbane) has more Ruby shops than that.. though they are startups most of the time, so, job security is a bit up in the air. Found that really interesting, thanks :)
Totally true, most of the work in Omaha, Lincoln, and Des Moines is enterprise/government .NET or Java. The web dev shops tend towards PHP and as a guy working at a Ruby shop, I'm pretty sure there are < 5 companies actively using Ruby in Lincoln, not sure about Omaha or Des Moines.