If you are not a regular monitor of your blogs, it's better to make all your comments a no follow, or else you might breach Google's terms of service. You may usually think about linking in terms of pointing to outside websites, but paying more attention to the anchor text …

There's a good chance you have some fantastic resources your audience would love. If you don't, get thinking. What can you build that would really interest your market? That others would share with their readers? Making use of the assets your business has will be a hook for getting attention …