While installing a new computer, I was trying to remember how to increase the number of simultaneous connections possible in Internet Explorer. So I stumbled on this site, which has an enormous amount of tweaks. Many are not interesting (to me) or already handled by PowerToy’s TweakUI, but I did find several new tweaks I really liked. Specifically I liked (and used) the one about how to add "Copy To Folder" and "Move To Folder" to Explorer context menu.
Another relevant site, with much much more options (although many are too basic to be interesting) can be found here.