On other distros I have run, vim remembers your command history even between sessions; this is especially handy when doing a lot of similar operations on different files.
For some reason, it has been flushing in Ubuntu 12.04, and I can't figure out why. Here is my :set
info:
:set
--- Options ---
background=dark helplang=en history=1000 nomodeline scroll=27 showmatch ttyfast
expandtab hidden incsearch ruler showcmd softtabstop=4 ttymouse=xterm2
backspace=indent,eol,start
fileencoding=utf-8
fileencodings=ucs-bom,utf-8,default,latin1
printoptions=paper:letter
runtimepath=~/.vim,/var/lib/vim/addons,/usr/share/vim/vimfiles,/usr/share/vim/vim73,/usr/share/vim/vimfiles/after,/var/lib/vim/addons/after,~/.vim/after
suffixes=.bak,~,.swp,.o,.info,.aux,.log,.dvi,.bbl,.blg,.brf,.cb,.ind,.idx,.ilg,.inx,.out,.toc