My two primary add-ins are Resharper and GhostDoc.
It would be really nice if the two could be integrated, so that Resharper
could use GhostDoc documentation as part of its Live Templates or vice versa.
I imagine that this could be done by extending the Macros in Live Templates
to support calling VS Macros (somehow). In this way I could call the GhostDoc
using a VS Macro.