Sej, do you have options that would work for flickr users? When we upload a photo there, we can choose from multiple sizes (from thumb all the way up to 1024 px wide) when it comes to BB Code or HTML, but if we select a URL/link to the image, it links to the page the image is on, requiring the viewer to click on the image one more time to see it full-size. As far as I can tell, there is no way for flickr users to post a URL link to the full-size version.
Otherwise, you could rest assured I'd be providing direct links to my full-size images - they all look so much better big!