Hello, I have 20 apparel related sites for an eCommerce I am doing. Examples would be "Large Womens Clothing", "Ladies Shoes", "Mens Suits", etc.. I am wondering if its good to have a menu on the left nav to each of the other sites from an SEO perspective. Naturally, normal traffic between sites will go up but will this hurt me in the SE's eyes as shady SEO work? I naturally want to interlink these if it will help in the SERPs without using nofollow and since they are all related I wasnt sure if having 20 menu items to each store would be ok or not. Currently, I have them on 5 different class C IPs - 4 per Class C and currently only link to one other from same Class C and 1 of each of the other Class C's giving me 5 links out to my other stores on each store site. Currently, I have all links offsite to my other stores as target="_blank", IE a new window I'd like to do all 20 though, just afraid SE's will burn me.