In all of my experience at Friday night meals, Aishes Chayil is always sung to the same tune. In the US and Israel, in Yeshivos and hotels, I've only heard one tune used.
What's the origin of this tune? Any information about it would be helpful.
This tune was composed by Ben Zion Shenker of the Modzitzer chassidim. I can't really do justice to his legacy in words here, but see the bio I've linked. His place at almost every shabbos table in the world is well deserved.
And a link to a recording of Ben Zion Shenker himself singing this: http://www.piyut.org.il/tradition/841.html?currPerformance=1093