Is it ever going to help anyone to `git blame` a line of a file and see a commit message like "Whoops, fixed a typo!"? No. But you can't avoid those types of commits.
What you can do is prevent those commits from going into the released history of the product. We develop all new features in feature branches (made _very_ easy with the commandline tool we built for it) and only after code review and acceptance testing do we squash merge it to master.
This lets us put together all of the commits, typo commits, WIP commits and whatever else into a combined commit that contains all of the changes that make up that feature. We even enforce a special syntax on the commit so when you look back in the history, you can trace it back to the code review and to the actual ticket that requested the work.
This means we keep all of our dirty backup commits until release time when we throw them all away in favor of the squashed commit. It makes git blame on any line of any file a sexy experience that provides accountability and an easy way to figure out why the code is the way it is.
Our commandline tool automates a lot of this for us. It's biggest benefit is the tie in with github (and this week bitbucket) to create pull requests and the "deliver" command that handles squash merging and providing the structure for the final commit.
It's all open source and available here: http://github.com/reenhanced/gitreflow/