Here are some of the top ten design mistakes:

- No author biographies. Unless you’re creating a corporate blog, readers will want to know who they’re reading. You should include more than just your name.
- No author photo: perhaps less important than the bio, but it offers “a more personable impression of the author,” which is usually one of the goals sought by blogs.
- Nondescript posting titles: this shouldn’t come as anything new to newspaper people. Even more so on the Web, your headlines must be catchy, but also explicit (if only for search engines).
- Mysterious links: make sure it’s clear to readers where each link will take them.
- Big stories buried: if there are a few postings that are high up on your favorite’s list, make them available to users. Link to these on the homepage, instead of expecting users to dig through the timeline to find them.
- Chronology as only means of navigation: except for (very) regular visitors, chronological navigation is rarely the best way to navigate a website or a blog. Categorize postings, use tags. Within each category you can link to the favorite postings.
- Irregular publishing frequency: it’s simple enough, don’t expect a blog to become successful if you publish irregularly. Not all blogs need daily updates, but readers should be able to expect when the next posting will come.
- All-inclusive content: by definition, the wider the spectrum of your topics, the less likely you are to attract loyal users drawn towards specific content.
- Forgetting you are publishing: although you may be used to publishing in the newspaper and consider the blog to be a much looser form, what you publish may be used as a reference in 10 years by… your next boss.
- Having a blog service domain name: having a domain name that ends in blogspot.com or typepad.com simply looks less – if not un – professional.

Source: Blogging Tips Guidance