I normally use Git for my personal projects but at work I use Mercurial. While I prefer Git overall, Mercurial has some nice commands that are missing from Git. One particularly useful one is hg out which prints the changesets in your local repository that are missing from the remote. Here is a simple script which does approximately the same thing for Git:

for i in $(git push -n $* 2>&1 \
    | awk '$1 ~ /[a-f0-9]+\.\.[a-f0-9]+/ { print $1; }')
    git log --oneline $i

Store it as git-out somewhere in your PATH and you can use git out just like a regular Git command.