
I found this helpful post that lists the top ten design mistakes that would affect blogs’ usability. If any author avoids doing them, s/he will have a certain theme and design for their blogs, and will maximize the number of new readers by giving them a good impression, and they will understand the author and his/her blog more.
1. No Author Biographies
2. No Author Photo
3. Nondescript Posting Titles
4. Links Don't Say Where They Go
5. Classic Hits are Buried
6. The Calendar is the Only Navigation
7. Irregular Publishing Frequency
8. Mixing Topics
9. Forgetting That You Write for Your Future Boss
10. Having a Domain Name Owned by a Weblog Service