Sometimes, working on a project in Vim, I have multiple splits open. However I frequently catch myself not using them. So I maximize the main split with the following simple command:
Ctrl-w _
To return to equal splits just fire the following command:
Ctrl-w =
Above is applied to a horizontal split (:sp); I am not sure if there a way to minimize vertically splited windows.
Update 29 november 2012: So I was playing around with shortcuts and found out that
Ctrl-w +
makes the split bigger by one line. By using numbers between Ctrl-w and +, you can make the split bigger by n lines, eg:
Ctrl-w 20+
It will result in a split being maximized by 10 lines.