I am unfamiliar with the law in this regard, but this item is on the finance page of PGary's website:

"American Express offers 1,500 Delta Airlines miles for opening a qualifying American Express IRA. For details, call 866-472-2384 and select option 2. Through April 30, 2004. I was under the impression that it is illegal to offer any kind of bonus to open an IRA. Ask how they get around this before accepting this offer. The offer was mentioned on Delta's Financial Partners Limited Time Offers page as of February 29, 2004."

PGary is at http://www.freefrequentflyermiles.com/index.htm