If you’re going to have a blog as a way of adding regular content to your site (in almost all cases, you should) make sure it goes in the main menu.
I was just asked by a client why he couldn’t “bury it in the footer”. Google knows the difference between a high profile section of your site (main menu) and something you just stick with all the legalese terms and conditions (footer).
If you want content to do a high profile job for you–it really needs to be a high profile section of your site.
