Star Trek Online was a core team of ~40-50 for two years. Kingdom of Loathing has had a dev team of about 5. Urban Dead is a one-man-show I think. How low do you want to go? STO is a AAA 3D game, so two years is almost unheard of. KoL and UD are both web-based, so I'm not sure what would be considered "surprising" other than hearing a game was developed by a sentient AI or somesuch. How about Minecraft, thats ~1-3 people and has now made millions (but is still technically alpha)?