1. Make sure that you can redirect all your domainnames via 301 to ONE domainname
2. Avoid DC by redirecting http://abc.com to http://www.abc.com
3. Create a robots.txt file
4. Disallow: several pages such as contact / imprint /shoppingbasket in the robots.txt
5. Put a link to the sitemap.xml in the robots.txt
6. Create an sitemap.xml file
7. Create a directory for the masked links an disallow it in the robots.txt
8. Create a Google Webmaster Tool Account
9. Create a Google Analytics Account
10. Create a favicon.ico
Haver FUN !