No Browder plays Mitchel. Romances on SG1 tend to follow the pattern of 1) guy falls for Carter 2) guy starts relationship with Carter 3) guy gets killed (and sometimes killed again). Jack has a thing for Carter and she has a thing for him but since he was her CO nobody made a move. They are married in an alternate reality, but he was also killed in that reality.
They play it very mature, no soap opera stuff, they just know they can't so they don't dwell on it or talk about it. None of the deaths of Carter's boyfriends can be traced back to Jack. :)
The whole Vala/Daniel thing is more her way of bugging him than a serious attempt at seduction, or so it seems.
I wish Sci Fi Channel would can some of these series and put the money into adaptations of some of the great SF novels.
ABC is coming out with a series that adapts great SF short stories, and I believe SciFi is considering such a show, too, so that's all for the good.