Mine is on blogger, too, and it can be a little difficult sometimes.
Don't get me wrong, I like it and would recommend it, but as for spacing and whatnot goes, you're kind of at their mercy.
I also use the space between paragraphs instead of an indent. I kind of have to do it on blogger, but even if I didn't, I'd still do it. That's just how I write. It's a good idea to break up big, unbroken walls of text. I realize in printed books, you're looking at a big wall of text, but reading on a computer screen is different. You want to break up your text on a screen so it's friendlier, less intimidating, and looks less of a task to read. The less work your reader thinks he has to commit to, the bigger chance you have of capturing his attention.
I like that your reading pane is narrow. That's good. And your font is easy to read. "Easy to read" would be what I would consider the single most important thing. So you seem to have that covered well.
I have a string of picture widgets down one side of mine, and a bunch of various other widgets down the other side. People might not scroll down to look at text, but believe you me they will do it to look at pictures. So you may want to consider sexying up that empty space there down the side. The nice thing about pictures is that all the reader has to do is glance at it and be instantly a "thousand word" into your story.
Man. You get a lot of comments! Good work! :-DD I'm jealous!