The problem is that when someone clicks a skip link, the viewport is scrolled to the #content, but pressing tab will bring focus to the site's main navigation. The expected behavior would be to select the first link in the #content, not the site's main navigation. Of course this is the browser's default behavior, and not really a _s bug, but it is an opportunity to make _s-based themes more accessible to users that navigate solely through keyboard input.
@aaronjorbin Thanks for taking a look at this.
Closing this because it was fixed when #139 was merged.