What format do you use? Full posts or excerpts?
Well, I use excerpts.
It's got lot off advantages like:
Displaying only post excerpts will ensure that you are not incurring any search engine penalties for duplicated content. If you display full posts on the homepage you will have the exact same content on two places, that is on the Homepage and on the single post pages (provided your archives do not display full posts, which could worsen the problem). Some SEO experts (including Michael Gray on this video) argue that this reason alone is sufficient for displaying post excerpts on the Homepage.
Have a nice day.