Corporate Blog Visitor Survey

Corporate blogs are a new entity on the web in the last year or so. I've been wondering if they actually fulfill a customer's need, and differently than a normal website. I have some ideas why a corporation might develop a blog, but I was wondering what blog readers thought about the whole idea. I'd like to propose this survey. If you have a corporate blog, and would like to post this survey, let me know your readers answers.

1) Why do you read corporate blogs?

2) How does a corporate blog differ from a website/forum/email/other marketing effort in your mind?

3) How should a corporate blog be structured? What content do you expect to see?