Agile Tools
It was fairly hard to find anyone in the Agile Track in DevTeach that wasn't using ReSharper. 100% of the presenters are using this, and have shown (and praised), ReSharper during their talk. Considerring that JetBrains wasn't involved in any of that, it says quite a bit. I think that the competetive advantage that ReSharper has over all other teams when selling to the Agile users is that they get it. ReSharper make it easier (frankly, possible) to me to work in the way that I find best practice. (As an aside, that was probably a huge miss on JetBrains' PR side, not being there.) The other tools that everyone used was TestDriven.Net, again, for the same reason, because it is the original zero friction tool, and it allows us to work more easily.
Beyond those, I can't think of anything else that came up repeatedly. Roy's passion for Final Builder was noted, but it is not something that I would call an Agile-Enabling tool.
Are you familiar with tools of the same calibar of ReSharper for the Agile practitioner in .Net? Not framework, mind you, I write enough of those, I am talking about tools.