Best practice - should blogs be combined into one website?

Topics: Business Logic Layer
Dec 29, 2008 at 4:29 PM
In my scenario, I have one design website and three blog websites about specific types of design.  I may also create a blog for the home page of the primary design website, too.

With respect to getting the best possible search engine rankings, would I be better served to combine these into one website containing three blogs?  Or should I leave each of them as separate sites, each with its own domain name and simply link between the sites?  Also, if I should leave the sites separate, then I am thinking that I should either create a blog or a news feed for the primary home page of the design site.  Am I correct in thinking this way?

Thanks for any help.