I'm not sure about Amanda Tapping's martial status.
But as a dedicated Sam/Jack shipper, I think the characters of Jack O'Neill and Samantha Carter should be married...
As in this link:
"A Hint For the Powers That Be"
http://www.fanfiction.net/s/2539486/1/
(No, I did not write it, I only wish I did)
I THINK she is married, and she was out at the beginning of the season on maternity leave.