On the users tab, we can currently see a list of users that we can view in four ways by clicking one of four tabs:
It would be great to see a fifth tab that allowed us to see users sorted by the number of votes they have cast.
This would encourage users to vote more often, which would help with adoption on new sites and getting the better questions and answers to float to the top.
The number of votes cast is, in a lot of ways, just as important as the number of votes received, because you can't have one without the other. Additionally voting is a great way to participate on more established sites like Stackoverflow that have so many questions and answers that it makes it difficult for new users to add something of value.
We already show this information on each user profile; this request would simply roll it up to the users page to be able to view another level of participation on the sites.