This past weekend, the 25th Sao Paulo Biennale opened in Brazil. Maybe you won't be jet-setting down to Brazil to see the show, which is on view through June 2 -- but no worries. This year, the exhibition features net art, presented online, among its offerings, both by artists from around the globe as well as by artists from the host country. The international segment, curated by Rudolf Frieling, features work by Italy's Francesca da Rimini, America's Kristin Lucas, and China's Shi Yong, among others -- clearly a very diverse mix. And the Brazilian portion offers up pieces by the likes of Giselle Beiguelman (already known internationally, and whose earlier work is pictured), Lucia Le