I use vim a lot of the time, mostly with splits and diffs, so the following key mappings and functions really helped me with managing the split windows. Maybe they will help you too. (Thanks to the Vim tips wiki for these).

• If you use vertical splits, this will help move left and right across the split. Put in your ~/.vimrc
  
" Map multi window keys
set wmw=0
" CTRL-H move to left window
nmap h
" CTRL-L move to right window
nmap l

• When scrolling up and down a window, you can use zz to jump the current line to the middle of the window. If you want this on always ala Scroll locking, then you can use this function. It is a toggle option. use \zz to toggle it. Put in your ~/.vimrc
  
" Map \zz to lock scroll to middle of window
map zz :let &scrolloff=999-&scrolloff

• In a window split (of any sort) if you want to maximise to the current window, this will do it for you. When you press CTRL-W then o it will maximise the current view, then when pressed again will return your split arrangement! Put in your ~/.vimrc
  
  " Max/unmax splits
  nnoremap O :call MaximizeToggle ()
  nnoremap o :call MaximizeToggle ()
  nnoremap :call MaximizeToggle ()

  function! MaximizeToggle()
if exists("s:maximize_session")
exec "source " . s:maximize_session
call delete(s:maximize_session)
unlet s:maximize_session
let &hidden=s:maximize_hidden_save
unlet s:maximize_hidden_save
else
let s:maximize_hidden_save = &hidden
let s:maximize_session = tempname()
set hidden
exec "mksession! " . s:maximize_session
only
endif
endfunction