I'm thinking about getting a Rackspace cloud account so I can get multiple IP addresses. My understanding is Rackspace allocates an IP when you create a site. So essentially you get different IPs for different domains, unless the domains are parked on each other (like Wordpress or Drupal Multisite). I host websites for many similar sites (like dentists) that can look like duplicate content - same information but different locations. Then Google sees that my sites all have the same IPs, and has penalized some of them. I also want to try getting multiple sites on the same SERP, and Google will probably prune my results if they're on the same IP. Any thoughts about this?