Engaging the blogosphere is a good point and a very powerful promotional tool for entrepreneurs. Home business owners should definitely participate in giveaways on a blog. The contests get a lot of attention and drive traffic to the blog and to your site making it a win-win for both of you. As a blogger I hate when businesses want me to blog about them, link to them, or do a product review without being willing to offer anything in return.

One thing I would add to this list is promoting your business by helping others. I have made some of my best sales and got my best clients because I constantly offer some free business advice to other entrepreneurs and volunteer teaching a business seminar once a month. People a) remember you, b) build trust in you, and c) recommend you to others who need your product/service.