Writing some code that may already exist?
It's wild friday afternoon idea time but it's occured to me that a very cool R# feature could be a feature to keep tabs on you and suggest that the class/function your writing may have have previously been written and suggest posible matches for refactoring. A nifty way of doing this could be score up the OM of your code and suggest possible odd's of a match based on some bayesian scoring. I see this being super useful for those with slippery memories who forget after a couple of hours of coding that a simliar peice of code may already exist and for those working with leagacy code who may be working with thousands of lines and with out the heat seeking test suite.