If you're applying for a designer job at a small slightly famous company, against tons of competition, and you can't take 1 minute to double check that you spell the company name exactly like they do, you don't deserve to be hired.
Designers are supposed to be totally detail oriented and notice things like spacing, typography, color, font, etc. 37Signals <> 37signals and a designer should totally notice that.
They probably had a few hundred other applicants do it right and they were absolutely correct to throw out every single application that had any kind of small errors, spelling mistakes, grammar mistakes, etc. They still probably had too many to interview after that.
They definitely hold the opinion that their fecal matter doesn't emit odors over there.