Personally, I think education is the best teacher, but sometimes you need a piece of paper to prove your skills. So, in addition to my 14 years of web development experience, two and a half years working on Ruby on Rails, and two years on BungeeConnect, I do have some certificates to back it up.
I'm a BCDN Member, having completed Bungee Labs' BungeeConnect Core Curriculum in October 2008:

I graduated Sang Shin's Ruby/JRruby/Rails Programming with Passion course in January 2009:
