I've often complained at the number of initiatives and incentives Microsoft's Partner Program gives. However it looks like they are cleaning it up just a tiny bit. Microsoft is putting $10 behind their Big Easy Offer program. Essentially if you upsell or cross-sell licensing you can benefit from it.
Basically Microsoft will send your customer a check, with your company's name on it. The article I read didn't explain it in great detail, but it appears that it might make things more simple by aggregating a lot of Microsoft's subsidy programs.