Gathered in London today for the G20 Summit aren't just Barack Obama, Angela Merkel, Nicolas Sarkozy and the like. They're being joined by 50 or so bloggers from around the world, under a program called G20Voice sponsored by OxfamGB, Comic Relief, Save the Children, the ONE campaign and Blue State Digital. The assembled bloggers are, says the program, amongst "the world's most interesting and influential," and the full list is available here. The chosen bloggers are featured in a photo spread worthy of TED speakers and are being farmed out for interviews. Credentialing new media for large-scale events isn't exactly new. Bloggers got the full media treatment at the recent Clinton Global Initiative in New York. And Blue State's Sam Graham-Felsen mentions that the inspiration for G20Voice was the Big Tent at the Democratic National Convention in Denver this summer. But treating bloggers as media might be a somewhat newer experience for bloggers from Nigeria, Turkey, Brazil, and the other lands represented in London this week.