There are demographics and social trends involved, if you think about it, as well as at least two clear means to redress the imbalance.

1) If this is noteworthy, is it because it's a problem?
2) If so, why not do something about it?
3) If not, what the hell's your point? (One possible alternative is: to make patronizing generalizations about women not having opinions.)

Based on reading Drum's blogroll I would guess:
1) he links to the same blogs that everyone else links to. He makes no effort to link to new weblogs that everyone HASN'T already heard of, and only middling effort to link to the best weblogs rather than the best known.
2) He updates the blogroll rarely, reinforcing the early adopter thing
3) He makes a conscious effort to link to conservative weblogs as well as liberal ones
3) He makes no conscious effort at all to link to weblogs by women.

As to the "hotness" thing: it is not exactly unheard of for women's looks to count more than men's in their professional success.

One observation: every female blogger I know of who does not blog under an explicitly female name has people assume she's male--even if she has actually referred to her gender or her screen name sounds more like a women's name than a man's.

"They are also far more male -- 79%! -- than I expected, versus 56% of NYTimes.com's reader. To be clear, the survey's responses are a fragment of a sample of a subset."

You can see the results here:
http://www.blogads.com/survey/blog_reader_survey.html.

So there is data out there. Of course, there's data out there about women and mathematics, too, but don't tell any feminists that. However, I know that here in the blogosphere, data is appreciated!

I worked in the Air Force as a statistician and knew a lot of mathematicians, both male and female. However, the most brilliant ones I knew were all male. However, I also teach remedial phonics, and more of the reading failures seem to be male. Women seem better at overall language skills than men, and girls seem less harmed by improper teaching of reading than boys.

Second, I don't see the problem here. Michelle Malkin is hot. (Note her sexy windblown hair in her blog picture.) Kevin Drum is not hot. (I don't care if Kevin has windblown hair or not.) That is why Michelle Malkin is in the top blogs. Now, this really doesn't explain the question, but who cares.

Now if Tia Carrere would have a blog, I would read it.

QED

There are a lot of women on the various comment sections, so I don't know that you can argue women don't like the debate aspect, and it would be difficult to figure out just how many men/women read the various blogs.

These days, name recognition is about the only thing that's going to drive someone to the top of the rankings quickly.