Michael Steeber, writing in his Tabletops newsletter:
Near the iPod’s zenith, Apple split the Genius Bar into three distinct experiences. The iPod Bar became a hub for iPod support and The Studio became a home for creative projects.
Apple Ginza and Apple SoHo were the first stores to add iPod Bars in 2005. Apple Fifth Avenue opened in 2006 with a combined 45-foot iPod Bar, Genius Bar, and The Studio. Then the iPhone arrived.
I had totally forgotten about this. My store never had one, but we ran two queues for a long time: one for Mac Genius appointments and one for iPods.