The git-spacehogs script can be used on a cloned repository to go
through your git history and locate large commits / files and will
prompt you to remove them.

git log -p <filename> will show you the commit history that affects a
particular file (or the current branch, or another ref) and shows the
patch / diff of changes.

I find it pretty useful, even if git history is more to type, it's
easier for me to remember, and tab completion is fantastic.

Woops