If you want to learn more about companies to invest in, or to discover companies that were not on your radar, then consider going to investor conferences. The problem with that though is that, if you are not a large investor with the money to spend to travel, you can’t go to these conferences. Web to the rescue – you can still view company presentations on the web!
For example, Rodman & Renshaw just held a conference covering various industries. Here is a link to their Metals & Mining “Track” of presentations:
Enjoy your research and of course, do tremendous due diligence before investing in anything.