I have a post with an ampersand (&) in the title. When it shows up in my list of popular posts the ampersand is printed in the html as
& rather than the proper escape code, which is breaking my page's validity. On the actual post page, WordPress escapes the ampersand properly as
& # 0 3 8 ; (I put the spaces in so that the forum doesn't translate it to the ampersand character). WordPress Popular Posts needs to do this as well so that post titles with special characters can show up in the list without making the page invalid XHTML.