Did you even try? Pretty obviously not.

Just following the obviously-named "WorldPerks" | "Earn Miles" | "Northwest & Airline Partners" links in the NWA.com menu would have brought you to this page: http://www.nwa.com/worldperks/earn/airfl.shtml

Clicking on the Delta link I'll leave to you as an exercise.

BTW, you're at least 2 years outdated on the EQM issue. I only started flying NW 2 years ago and the CO/DL issues were the same then as they are now - and the opposite of what you recall. Those changes happened before that. DL is 100% EQM on coach fares regardless of fare class. It's CO that has the 50% EQM issue on low fare classes. Both those were that way at least since early 2005 when I started flying NW.