Canon EOS Rebel XS / 1000D Review This review is very late and resembles the Canon EOS T1i / 500D Review, but it's on the site. :)
From the review : "An XS feature not found on the XTi is the self-cleaning sensor."
The XTi does have a self-cleaning sensor. It has been the first Rebel to have it.
Starting at "The only T1i accessory requirement", you're referring to the camera as a T1i for a few sentences.
Thanks for the editing help - I've corrected those errors.