Coors? Miller? I thought this was a beer thread!
For me, it depends a bit on the time of year. During the Summer when it gets hot, I spend a lot of time with IPA's-- mainly Summit and New Belgium (I don't think Summit would be considered commercial). Also Boddingtons. Most frequently when it hits ninety or above, I'll have hard cider (Woodchuck). Strongbow is good, too.
But normally, Fat Tire (and derivatives) mainly, as far as commercial beers. I really like dark(er) brews. Stout especially. Guiness and Murphy's. Sam Adams is alright, but I don't want to financially support them after they promoted that thing with that radio show.