StructureMap is fairly mainstream, so I figure it will be on there. I used it for IoC, but I've also used it as a file system scanner to dynamically load libraries. Pretty sweet stuff.

>Ah.. I didn't check NuGet.
>
>>A couple of demos I have seen recently advocated installing NuGet as an extension, then NuGet installs other tools such as StructureMap. I don't really know enough about it to say one way is better than the other.