if I want to change windows in emacs I do C-x o and that\'s fine with me...but when I want to change window lots of times in a row C-x o is not so convenient...is there a wa
Check out windmove; it lets you just hold down a modifier key and press an arrow key to move to the window in that direction. I've been using it for years with the default modifier (shift) and strangely enough it doesn't interfere with my impulses to use shift-arrow text selection in other applications.
There's also an equivalent for frames, which I should really try...