I worked at Google 2006-2009. I joined a 20% project with an awesome staff engineer, then recruiting one of my team-mates to join 20% too. We ended up working o

I worked at Google 2006-2009. I joined a 20% project with an awesome staff engineer, then recruiting one of my team-mates to join 20% too. We ended up working on it full-time. It didn't end up launching but I think the core code ended up being used as part of other products. It was incredibly rewarding and a great outlet from my typical day-to-day improving Adwords.