Weird...Help?

So, for some reason my blog won't let people post comments. I have checked the settings of my comment stuff and everything is set normal but to no avail. I don't know what the problem is and am in need of some help. If anyone knows what to do can you....I guess email me (b/c the comment thing isn't working!) mizzmo@gmail.com.
OH, and how do you guys put pictures up at the top on your blog title? It's so cute and I just love the effect. It's like "BAM! Here I am!!!" Nice :)