I don't like blog posts apologizing for why someone isn't blogging. Most likely I'm too busy to have missed you in my aggregator anyway so why draw attention to it?
It is true that I've been busy lately and have not had much time to write. I do only try to write posts that are interesting and helpful, so I especially appreciated Penelope Trunk's five tips for writing a blog post people love. Start strong, be short, be passionate, and more. Read the whole post.