Julie Powell says she wasn’t thinking book or movie deal when she began blogging her recipe-by-recipe adventure through Julia Child’s “Mastering the Art of French Cooking.”

She was just looking for an escape from a series of dead-end jobs that had put a damper on her dreams of becoming a writer.

But Powell found more than an outlet with her “Julie & Julia Project.”

Her blog became a memoir, “Julie and Julia: 365 Days, 524 Recipes, 1 Tiny Apartment Kitchen,” which was later, “Julie and Julia: My Year of Cooking Dangerously,” which then became a movie — “Julie & Julia, which opened Friday with Meryl Streep and Amy Adams as stars. (The movie is also based on Child’s “My Life in France.”)

“I had no idea what it was going to do for me when I started,” Powell says of her blog, which she started in 2002 at age 29. “It was really sort of a personal project to cut out a piece of my daily existence, purely for me, that gave me a creative outlet so the rest of my life didn’t seem so stultifying.”

Few bloggers will come close to Powell’s success, say blog experts, especially considering there are 133 million blogs afloat on the Web, according to blog search engine Technorati, which has kept track since 2002.

Even Powell admits what happened to her was serendipitous — she was “at the right place at the right time.” The blogosphere was a much smaller place seven years ago, making it easier for frustrated secretaries like herself and fans of Child to stumble upon it. A write-up in The New York Times helped land her the book deal.

“It’s such a challenge to keep up a blog now,” says Powell. She considers herself someone who blogs occasionally as opposed to a blogger. “It requires a great deal of rigor, discipline, a real stick-to-it-ness.”

Most people are not starting a blog to find stardom, according to Jennifer McLean of Technorati. According to Technorati’s State of the Blogosphere 2008 report, top reasons are self-expression and sharing expertise, followed by networking and gaining entry into the media world. Other reasons include activism, book publicity, personal satisfaction and to become known as an expert.

But there has been a rise in a “professional class of bloggers,” said McLean, such as Perez Hilton, Grace Bonney (interior decorating) and Zen Habits (goals and productivity).

People may not find Hilton or Powell fame, “but it is amazing to see how many bloggers do become quite well-known within the niches that they write about,” says Darren Rowse, of ProBlogger.net. “Blogging certainly has the ability to help you grow your profile, but it’s usually within an industry or topic.”

Rowse, who started blogging seven years ago to collect his thoughts and connect with others, says success really depends on why someone started a blog.

Some bloggers who are hoping to attract advertisers measure it in the number of visitors. Others who want to increase their profile focus more on the number of comments or sites linking to their blog. Still for others, it’s about personal satisfaction.

Gretchen Rubin, author of the forthcoming memoir “The Happiness Project,” says she chose to blog about her quest for happiness because it was something new and challenging, and she wanted to chronicle her steps. But it was hearing back from the readers that was gratifying, she says.

Five tips for success online

Chances are, your blog is not going to land you a book or movie deal like Julie Powell or make you a superstar like Perez Hilton. But it can bring you personal satisfaction, give you an outlet for expression, help you connect with others and even assist you with leveraging a business. Along the way, you may even come across a little fame. Here’s how:

• Blog about what you are passionate about, says Jennifer McLean of blog search engine Technorati. Coming up with fresh and interesting content is easier. And if you’re only blogging for money or fame, readers will pick up on it, she says.

• Make sure you post frequently, says Gretchen Rubin, who blogs about happiness. “That is a sign of vitality on a blog.” And have a clear idea of what you are blogging about. Blogs do better when you have a focus.

• If you are an aspiring author, show that you have a loyal following, says Brooke Warner, senior editor at Seal Press. “When someone says I get 25,000 unique visitors a month, we pay attention,” she says. “They have readers, and either their story or writing is really good.”

• Develop a unique voice. Powell, who blogged about cooking all the recipes in a Julia Child cookbook, had a “unique hook,” says Ellen Gerstein, vice president of marketing for John Wiley & Sons. She also brought a lot of humor to her blog.

• Spend time on marketing, says Darren Rowse of ProBlogger.net, a blog with tips for bloggers. With millions of blogs afloat on the Web, writing posts isn’t enough to attract followers, he says. Focus on writing guest posts for other blogs or networking, for example.