While this addon is part of my TradeSkillMaster suite of addons, this has just recently been added to the suite and is probably the most useful one to use for what it is rather than alongside side all the other TSM modules. Also, I know there are dozens of milling and prospecting addons (and many people are fine with just using a macro), but I have found a way to very significantly increase the speed at which you can mill or prospect.
See this post for an in depth description of how exactly this addon is faster than the ones already out there. Download TradeSkillMaster_Destroying here and the main TradeSkillMaster addon here (required). The main one simply provides the framework for all the modules and does nothing by itself but is required by all the modules.
It's not completely polished yet obviously but has been pretty extensively tested and is working without obvious bugs.