Comic Sanshttp://www.comicsanscriminal.com/
For what purpose? there are few different fonts for different situations :(
http://www.comicsanscriminal.com/ (http://www.comicsanscriminal.com/)
http://bancomicsans.com/main/ (http://bancomicsans.com/main/)
http://comicsansmustdie.tumblr.com/ (http://comicsansmustdie.tumblr.com/)
It's all about Source Sans Pro. It has this professional vibe with a PDF friendly look.