I can't imagine deciding against picking up a book to read because its author is female, but if we didn't judge books based on things other than their content, all books could just be a flat light grey with their titles printed in an easy-to-read font. So I judge books (at least a little) by their covers, and part of that includes the author's name*. If an author's name is gender-ambiguous, I don't feel any great need to find out their sex. In some cases, the rest of the book cover gives that away (P.C. Cast, anyone?), but by and large gender doesn't really matter to me when choosing an author, as long as the book looks good.
The reason I said I could kind of see Buddy's point is that, when I thought about it, I realized that most of my favourite authors are male (Terry Pratchett, Neil Gaiman, Robert A. Heinlein, etc.). I don't think that's because of their use of “male” language (although, in the case of Gaiman and Pratchett, I would say it definitely has something to do with their British language), so much as the (often) male perspective on characters. Apart from a clever and engaging style, what I look for most in fiction is something character-driven. Fun and wonderful plots are all well and good, but if I don't care about the characters, I can hardly be expected to care about how they spend their time... and I think that men are more likely to write characters I care about. The reason for this? Flaws. Female authors (and I am way generalizing here; clearly I don't think this is true of all female authors) tend to have the unfortunate habit of forgetting to give their protagonists flaws of any kind – and many times, when they do have flaws, they're things like thinking that they're more flawed than they really are. I like my characters to be overcoming addiction, or give careless criticisms to people or be so heartsick that they can barely function. I don't want to read men who never ask for directions and frequently forget to pick up milk or women who insist on watching chick flicks and won't eat Chinese. There are flaws and there are quirks, and I think male authors are quicker to heap on the flaws when their characters are in their planning stages.
With all of that being said, I should mention that my favourite book EVER is Pride and Prejudice. Jane Austen's style is very distinctly female and her characters are real, flawed people who I can relate to and enjoy reading about.
A few (though admittedly, a very few) people on Book Blogs didn't think there was much of a difference between male and female authors and Amanda Markham, the author of the blog that prompted this whole thing, points out that “... men can be every bit as fluffy and emotional as women”. This is true, but, as Ms. Markham goes on to point out, there is a discernible difference between the way women write and the way men write. She directs her readers (and I direct you) to the Gender Genie, which boasts something like 80% accuracy when determining if a passage was written by a male or female author. What's really interesting is that it shows you how it reached its conclusion, which is great, especially if you want to get really good at writing first person characters who aren't the same sex as you.
I'm still fairly ambivalent about this issue, because while there are traits that are often attributed to female authors (some of which I attribute to female authors in this post), I don't think that women should strive to be/write/act more like men. Actually, I think that if everyone strove to be and write more like themselves, we would have a lot more interesting and varied fiction available to us and a lot less weird men refusing to read woman authors.
*If an author has a name like Adrienne Loveheart, I'm likely to avoid anything she's written on principal.