Never again will we have to drive around San Francisco at 9 p.m., crying and pummeling the steering wheel because there's no damn place to work and get some caffeine. Now we just go straight to the Summit — open until midnight Tuesday through Sunday — and wind up procrastinating in a sea of Mac-owning, card-carrying start-up junkies. Its high ceilings, artsy but industrial atmosphere, and flowing Blue Bottle coffee make us feel strangely productive. For those who are unemployed or underemployed, the Summit — which doubles as an Internet cafe and a home for workspace incubator and angel investment fund i/o Ventures — also holds networking potential.