With the new nav, on the front page or in a tag view, there are various dropdowns to select between selection and sorting options each with 2–4 options.
Clicking on a dropdown just to select between two options is too hard work. I find this especially annoying after a tag search, when I want to switch from “active” to “newest”. In the old nav, or when searching with criteria other than tags, it's a single click. Now, it's a click, move the mouse a little, click again.
There's plenty of white space here to expand on the UI a bit. For example, here, there's plenty of room for five radio buttons.
tags: ·all ·favorite •custom sort: ·asked •active