It's not online, but my interview with Julie Powell (Julie & Julia) is in the current issue of Fashion. (In the "Culture" section, where else?)
Most of the interview concerns her new memoir, Cleaving, which recounts the huge pit her life fell into a couple of years after her year of cooking according to Julia Child. There's infidelity, sex with strangers, unhealthy obsession, and a whole lot of butchery. It's a long way from the tone of the first book and, especially, the movie, which I had to actually pay to see after arriving at the press screening five minutes late. About 20 minutes in, I decided they ought to be paying me to sit there. (Though Streep is fun to watch, etc etc.) She's mostly careful about it, but from her comments to me (many of which are in the article), I get the feeling Powell's not a huge fan of the movie, either.