http://dearcoquette.com/
I love this blogger. She is hilarious and on point with almost everything she says. The only thing I don't like is that she only gives advice. I wish she wrote more about life and current issues. It is also a little to blue for my taste.
She updates fairly regularly, her last post was on Sunday. The point of her blog is to give advice and respond to comments, so to continue to hold all the followers she has she really needs to post often.
The fact that it is an active advice blog really answers the third question. Her site is based off comments and questions.  
She doesn't use much media. Just a picture here and there. It's an advice blog though, so there really isn't a huge need for that much multimedia.