Helvetireader is a userscript that pares down Google Reader to what I consider to be the essentials. In particular, it's made for looking at feeds in the expanded view, using Keyboard Shortcuts instead of on-screen buttons. It’s not going to suit how everyone uses Google Reader, so you can take the CSS and personalise to your hearts content!
All you need is a browser that supports userscripts (see below) and, of course, Helvetica.
