I seem to remember ''two quotes'' rendering as <em>emphasis</em>, but now it is rendered as <i>italics</i>. It also says "emphasis" in both
http://meta.wikimedia.org/wiki/Help:Wikitext_quick_reference#Basic_text_form...
and
http://en.wikipedia.org/wiki/Wikipedia:How_to_edit_a_page#Character_formatti...
so I don't think it's just my bad memory. Was this changed accidentally?
Likewise for strong/bold.