Co\Contra-Variance in C# 4.0
Running behind on everything again, picked up a nasty stomach bug that laid me out for a few days (not being able to pick Darcey up was a not nice but making up for it now with hugs-a-plenty). My thanks to Rob for the reminder that my long time wish has been granted and the C# team has added a form of Co\Contra-variance to C# 4.0. Charlie Calvert, Community PM for C# has the details although I do recommend that as background reading you first read Eric Lipperts series.