One of the keys to a successful blog is commenting on other blogs in your niche and on the blogs of thought leaders in your field. We detail this in our CODA system (you can learn more in our free report on Better Business Blogging).
The questions then become: are you getting the most out of your comments? Are your comments creating visibility for you?
We talk a lot of creating massive visibility. Part of being visible relates to the visual image you use through out the web. Many bloggers use a plugin on their blog that enables pictures to be displayed along side comments. My first suggestion is for you to set up your Gravatar account so you can take advantage of this. It's easy and it's free.
Then when you comment on a blog that uses the Gravatar plugin, you will become immediately more visible and identifiable to other blog readers. Make sure you set it up will ALL email addresses you use so it can "follow" you from blog to blog comment.
TypePad has a similar visual system now called TypePad Connect...
You do not have to have a blog built on TypePad to set up an account. And I recommend you do set one up. It's compatible all the big blogging platforms.
You create your profile, you add your photo and bingo, whenever you're on a blog with TypePad Connect enabled, your picture shows up and other readers can click through to get to know you better on your profile.
By implementing these two tactics -- setting up a Gravatar and creating a TypePad Connect profile -- you're turbo charging your blog comments and creating a more effective and identifiable presence on the Web.
BTW, the other thing I preach about a lot is that you need to be consistent with the images you use on the web. I know not everyone agrees with me on this, but I believe you should be using the same or similar image on ALL your social networking sites, blog profiles, etc. That way when someone lands on your twitter profile, for example, and then clicks through to your blog to check you out, they see the same image and know they are in the right place.