I had to make some minor edits to the Blogger template used here anyway, so I decided to have a little monkey with the fonts. Here's what you used to get:
And here's what you now get:
I think that's much better. Good old Helvetica! I don't understand anything about typography at all, but I think that the latter doesn't look as messy, perhaps because of the spacing being tighter. Interestingly the title actually takes up more space, because the bold font is heavier. Marvellous.