This is a good article, as usual, from Jonathan Morrow, of CopyBlogger.com.
I don't usually worry too much about being interesting in my blog. I don't feel guilty boring anyone - they don't have to read it after all. In fact, I don't really worry about being interesting in my real life either. People are interested in all different things, and I am pretty sure I am one of the more boring people around. My favorite hobbies are reading and knitting, and I tend to talk incessantly about my children and husband. Zzzzzzz.
I think blogging, for me, is more about being interestED than interestING. I am always fascinated with what is going on in the world around me, and my blog(s) are an outlet for me to express that wonder.
If someone wants to read it --- that's even more wonderful.
Cheers and thanks for reading!