Is there any way to see the list of the most upvoted and the most viewed questions in this day/week/month?
Most views (all-time) ... someone on Mathoverflow showed how to do it. Here is the result for math.se
There is this feature already -- it's called
greatest-hits and it isn't linked anywhere. I know, it's frustrating!
For Math, you can see this list of questions by adding
/greatest-hits to the questions URL. Basically, just click here and you should see the page.
This is a dynamic list of the top 1000 questions on your site, with views and votes getting weighted into the placement.