Here is another worthwhile article on weblog design and layout from How to Save the World. His 9 main points are:
– Use Titles
– Abstract Long Posts
– Use a Teaser Paragraph for Long Posts
– Select a Readable Font, Size & Column Width
– If You’re a ‘Linker’, Add Something of Value
– Give Readers Someplace to Go for More
– Use Graphics If They Add Something
– Use Categories Only If They Help Your Readers
– Use Outlining ‘Twisties’ Cautiously
Each is expanded really well in the original post.