Post team games in this thread to analyze team strategy, as opposed to individual combos. I feel that this is often a neglected aspect of the game, one which we can exploit.
I want everyone to post replays like this one: http://www.sendspace.com/file/x6d5pd Notice the vital role of communication in the game.
Also I want everyone to be able to calculate the spell purchase order for each and every permutation of build and gold per turn. This is not as complicated as it sounds. If the gold per turn is constant, ie; 10, then it should be fairly simple to chart out the spell purchase order before hand. Everyone knows when to pool gold, and who to give it to at what time without confusion.
Ideally a simple calculating tool can be designed to do all that work for you. Just input your build and your teammates builds as well as the constants, and viola, you have just maximized your purchasing power. Until then, a mere spreadsheet will suffice.