It's a movie about two women, from two different times but looking for the same thing: something to do. Meryl Streep puts in an excellent performance as Julia Child, and at points you forget that it's not Julia Child on the screen.
It's a lot of fun seeing Julie and Julia go through much the same experiences as the movie switches back and forth between the two characters. Whether their lives really ran as parallel as it seemed in the movie or if it was just done that way for the movie, I don't know.
Julie & Julia is a very enjoyable movie to watch, with lots of humour in it. Definitely worth seeing.