Did you notice it's Carolyn Leonhart doing those? I wonder why Cynthia Calhoun and Vicky Cave weren't on this one - but Carolyn has been doing stuff with them for a while now, along with her brother. (And I think their father had some association with SD, too - though I can't recall what it was.)
On the 2VN tour, they had each of the singers do "Dirty Work"; the night I saw them, it was Carolyn's turn. Her voice (though the voice range she's singing in on "Pixeleen" doesn't demonstrate it) is actually very dark and sensual. That girl has everything - she's also very beautiful!
Actually though, "Dirty Work" is the one and only Steely Dan song I really hate. "Do It Again" is next. But other than those 2 everything is great, as are Donald's solo albums. Walter Becker would be best serves not putting out any other singles albums, although "Slag of Ages" is a good song.
And let's face it, even SD's mediocre stuff is better than most anything else out there today.