Speaking of which; when advising to use multiple domains should really mention not to go overboard on the number you use. Too many alternative domains and you

Speaking of which; when advising to use multiple domains should really mention not to go overboard on the number you use. Too many alternative domains and you will get a new warning from yslow. Every time you pull from a new domain, this will incur a dns lookup, might even end up with the page going slower because them.