Jakob Nielsen has discussed the issue of "weblog usability" in a succinct and efficient way. In his website he has a webpage “Weblog Usability: The Top Ten Design Mistakes” in which he identifies the following points as top ten mistakes that bloggers should avoid to enhance the usability of their weblogs. In terms of Nielsen’s webpage these mistakes are:
"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, and (10) Having a Domain Name Owned by a Weblog Service."
You can read the whole story about the usability of weblogs in Nielsen's website. He also has written “Top Ten Web Design Mistakes”.