I was looking through the settings in Firefox earlier today and ended up clicking through to one of the help pages (Firefox's performance settings) which, IMHO, has a bit of excessive whitespace usage going on. After the fuss that browser vendors made about reducing the amount of vertical screen real-estate used by their browser chrome, it seems a bit rude to be using quite so much for the branding/top-hat in content pages. Here's a side by side comparison:
That's quite a bit of extra content (16.7% to be precise-ish) displayed, just by not having the browser brand take up an entire strip of the page, on my 1920x1080 screen. It's a little bit like the recent Skype client that was more white space than conversation, just not quite as bad.
My skillset has matured somewhat since then, which you'll probably see from the posts here. You can read a bit more about me on the about page of the site, or check out some of the other posts on my areas of interest.