The Facebook app on Windows phone has a nice and unobtrusive back to top button that only appears once you scroll past a certain point, and only when you start scrolling up the page. This code offers similar functionality using jQuery.
When I was looking for an alternative to Masonry to produce a responsive Pinterest style grid that was a lot simpler and lighter weight I came across this jQuery plugin on www.jqueryscript.net that is very simple and works well. However, It has a few issues which I needed to fix before I could use it.
I have wanted to add protection from vavigating away from some of my web forms but most of the solutions I have seen do not work well with ASP.NET with it's many possible ways of posting back and AJAX using Update Panels.
...Or an alternative to media queries for responsive design
I really like the concept of responsive design, and I have read a lot of the positive stuff about it, and also read a lot of the negative too.