Nike. I'm a slave to them since who knows when. Every shoe I buy, I know I'm supporting some kid in Indonesia or Vietnam. Yeah, their advertising is the best - slogans that just make sense. Everyone else is imitating.
What keeps me coming back though is the style is just so cool. slick kicks, etc. Fuckin Reebok has stopped me from buying any new NBA jerseys.
They practically bought everyone too: Converse, Starter, and Shaq's Dunkman.