Rob Kerth has been getting plenty of Zamboni action the last few nights. Midtown Business Association's executive director has been staying up late and going out in the early-morning dark to use the ice groomer to help create an ice-skating rink that opens at 10 a.m. Friday in Midtown. "It's a tremendous amount of work to put up one of these portable rinks," Kerth said Wednesday. "I've been there until 4 in the morning at least five out of the last 10 days." While most business association leaders might not even know how to spell "Zamboni," Kerth not only knows how to drive one, he owns one. And he has the license to drive it. That's because until last year, Kerth owned Ice Unlimited,

Midtown's MARRS Building has a full house again with three new tenants coming on board this month. Two spaces have been vacant for several months after business owners left without a word and without paying all their bills — which really hurts after the effort the company made to help them be successful, said building owner Michael Heller of Heller Pacific. "We help these tenants. We help them get their permits, we help with their construction, we market them," he said. "So when they don't honor their obligations, it's hurtful to us." New tenants in the block-long building, whose renovation was completed in 2007, include a shop that sells jeans, a sandwich shop and a comedy club. All th

The recent closing of his DV8 Boutique in Midtown was rough. But Michael Afshar doesn't have time to dwell on that. He's too busy DJ'ing his way through Europe right now. Considered by some to be a pioneer of San Francisco's underground house scene, Afshar — who entertains under the name DJ Skittles — is in St. Petersburg, Russia, after gigs in Amsterdam, Netherlands. Soon, he'll be spinning tech and electro house music in Moscow and Ukraine. "I have been playing in different countries every week now," he e-mailed in between gigs. "I had played in many venues in the world in the past. This is me going back to one of the things I love the most: music and flying in airplanes." The former