Two preprints on the Grothendieck ring of geometric dg categories and categorical measures:
Benjamin Antieau, Jeremiah Heller, Some remarks on topological K-theory of dg categories is a short preprint on topological K-theory, proving nice facts about it. It also contains the following acknowledgment:
Finally, this paper would probably not be possible without the dogs Boschko and Lima, who created the opportunity for the authors to work together.
I'd love to know the story behind this!
Sarah Witherspoon, An introduction to Hochschild cohomology is a draft of a book on Hochschild cohomology. The world needed this, as is clear from this MathOverflow question asking what such a book would have to contain. She focusses on Hochschild cohomology of algebras, and studies applications such as support varieties and Hopf algebras.
In case the link to the version of August 18 2017 ever becomes inactive, take a look at her list of publications.