I know I'm a bit of a repeat offender on this, but the way people use hyperlinks in blogs often serves to make content unreadable.
I've been meaning to write a post on this, but it's now been done by the ultimate authority. Read Jacob Nielsen on making your blog more user-friendly.
I think his point about common blogname suffixes looking amateurish is a bit overblown though (see point 10).
My day-job involves advising people on how to make the most of their websites, and I'm always telling them to keep it simple and use hosted solutions as plug-ins to their site (unless they've got loads of money - then the only option is to pay us to develop something bespoke!).