Learn and create my own Chef cookbooks vs just using Vagrant now.
Heard about using dsh as a, more or less, a reverse SSH proxy.
Figure out and use South django migrations.
Implement a bloom filter. Implementing a bayesian filter made it so much more understandable to me, I figure this would work the same.
There's a few other, more specific ones. But this is a fairly new workflow for me. I like the idea somebody mentioned about keeping a rough idea of how many hours you've spent on it.
I know "me too" is bad form but since upvotes to pestaa's reply can't be seen this is the only way I can show encoderer that more people would be interested in more examples. (Blog it up if it would be too big for a reply.)