Whenever I put an image into a post it will look fine in the WordPress editor but then always appear to be aligned to the left side when published. I've searched through the forums and read the documentation Wrapping Text Around Images, to no avail. You can see it happen in this post, and the source for the image, which is clearly supposed to be aligned right -- and appears so in the editor -- but readers see it on the left. This happens in both IE and Firefox.
<img src="http://www.sportsseoul.com/news/baseball/pro/070907/72_465249_2.jpg" class="right" height="234" width="291" />