MC - I would do a search on the board for this very thing. 'Best Sponsors' you will find a good selection of posts and some threads that have been started just recently as well asking the very same thing..and you will probably find pretty much the same answers from the majority. Not many share there hidden gem programs because it attracts competition..and although all of us are in pure competition with each other to an extent, none of us really like to add more.
Your best bet to get a grip on whats doing what is to check GreenGuy's numbers that he shares with the board each quarter or so.
Green Guy Stats