Here's my blog: http://adambourg.posterous.com/
Any Thoughts?
If people come back to your blog it's because they like an existing post, so if your writing about programming 95%+ of your posts should be about this.
Thinking about writing about another topic as well? Start another blog!
Note: This is actually something that I fail at :)
Good: "Deliver 2 blog posts per week that can help small business owners with their internet marketing."
Bad: "Get 100 new subscribers and 10 new comments."
- write in your own voice
- write often, at a regular interval
- bring value to the reader - stuff they care about, stuff they need to know, etc. learn, share, grow.
- take positions, don't be afraid to offend someone like that
there you go. this more or less works. ultimately figure out what your blog is about. the above assumes you mean "how can i get more readers and interactions?" but ultimately figure out what it is you want to achieve: visibility, knowledge, interactions, etc. your blog may or may not be the best place to do that then.