Design principles. From Google.
1. Focus on people—their lives, their work, their dreams.
2. Every millisecond counts.
3. Simplicity is powerful.
4. Engage beginners and attract experts.
5. Dare to innovate.
6. Design for the world.
7. Plan for today’s and tomorrow’s business.
8. Delight the eye without distracting the mind.
9. Be worthy of people’s trust.
10. Add a human touch.
(Link: Official Google Blog: What makes a design “Googley”?)
So I see you made the leap to Disqus. Did you have to delete all of your old comments? With Blogger, I worry that it will be a pain to go back now that I've used it for a few months. You'll want to make your decision early – or risk being in the same boat that I'm in.
With Disqus, though, I love the ability to reply to comments via email. I love the threaded posts. And I love how it track's each user's comments, forever. Or maybe that should be “forever?”.
The only thing that I can see missing from Disqus is the ability for non-account holders to subscribe to comments via email. I've bugged them about this and they promise that it's a feature that will be coming soon.