At the moment, there are at least 11 different ways to get EMF, topped just the way you like it:
- 9 zips: 3 SDKs (EMF-SDO-XSD, EMF-SDO, XSD SDK), 3 runtimes (EMF-SDO, XSD & Standalone), examples, tests, and models 
- 2 different Update Manager methods (install EMF-SDO-XSD SDK or install individual features) 
Is this sufficient? Some say it's already overkill, but others say no, and with the lofty goal of pleasing most of the people, most of the time, we're now exploring creating a whole new set of features in EMF .
This new set of features  is intended to add more options via Update Manager, as that's the most commonly used mechanism (80% of all requests tracked by eclipse.org last year) for downloading EMF. The old features remain -- they're just being chopped up more finely.
Those who want fries with that can order a combo meal and drive forward to the second window to pick up their zips; those who want EMF à la carte will now be able to order off the Update Manager menu, so they can pick and choose the toppings, er, features, they want for their special-needs diet.
Please comment or vote for bug 106804 if you have concerns or kudos.