What impact does cdn utilization have on SEO?

[Timmmmy]

I've set up a new online store and prepping to roll out. I've implemented Amazon Cloudfront to host all of my static files:  images, style sheets, javascript files and small template related images to assist in speeding up this Magento site.

1. Any reason not to do this?

2. What are the SEO implications of having images that arent' stored on the same domain?

3. Does it make a difference if I refer to these files from the amazon cloudfront domain vs. seting up a subdomain like cdn.mywebsite.com?

Thanks for any feedback.

[MarieHaynes]

I don't know the answer for sure, but at first I was wondering what problem utilizing Canadians would make.