Mediaweek.com:

Over at NBC, the combination of Dateline (HH: 3, 4.7/ 8; A18-49: #4, 2.0/ 5), American Dreams (HH: #4, 4.2/ 6; A18-49: #4, 2.2/ 5), Law & Order: Criminal Intent (HH: #3, 8.0/12; A18-49: #3, 3.8/ 9) and Crossing Jordan (HH: #2, 8.0/13; A18-49: #3, 4.1/ 9) were all below average because of baseball. Evidence of how the tide has turned at 9 p.m. was highly visible last night. Take a look:

ok from what I can make out from this, American Dreams is holding it's ratings in the important 18-49 audience. Law and Order and Crossing Jordan have higher ratings but an older audience
But you must remember that NBC pushes ads for those 2 shows and not for American Dreams. It is as if they are the only 2 NBC shows on Sunday night.