If you are looking to setup a WordPress based blog or already have one, check out the Semiologic Blogging system. It has the WordPress engine but includes several enhancements- a very flexible theme, lots of useful plugins built-in and a highly SEO friendly structure.
I also offer the Semiologic blogging system with an added bonus:
2 hours of customization service free of cost along with a free installation on one domain. Write to me at arun AT ebizindia DOT com with [Rentablogger] in the subject.