Hmmm.. Sorry but what is DfM?
I have a new 2.0Ghz, Core 2 Duo, 1Gb RAM 17" iMac that works fine under 1892.6, and worked fine also under 1884. Have XP SP2 (Home) loaded, along with Office, Dreamweaver, FM Pro, IE 7, Opera FireFox, and other software. It works fine on a network and shares a file with my G5 Tower.
Others with iMacs have been successful, but many with Mac Pro and MacBook Pro with more memory seem to have mixed result.