If you find yourself scrambling for something to write a post about, I have a suggestion: A QUIZ!
"Quiz" probably isn't the word for what I'm thinking of. I've seen it called a meme, a blog hop, even a blog award. Whatever you call it, you ask some questions and invite your readers to answer them, either in the comments or on their own blog with a "ping back" to yours. (Or, if you work with Blogger, a comment on your blog with the address of their answers.)
One I participate in is Share Your World, hosted by Melanie. She gives us four or five discussion questions, which we answer on our own blogs and "ping back" to hers. It's fun to do, and even if the questions are serious, I usually find a way to make my answer humorous, which is not the same as humerus, the bone between your shoulder and your elbow.
Give it a try sometime. I think you'll enjoy it.