I'm just sitting here shaking my head at the idea of any DM letting their players into the DMG (in any edition) to look up magic items.
They belong in the DMG, with information about their properties safe in the hands of the DM to give out when discovered either via field testing or spell e.g. identify. Were I ever to run 4e, one major headache for me would be to re-do the whole magic item table and then tell the players to ignore that entire chapter in the PHB. (then again, I know myself; I'd likely take a path of less resistance and swipe an item list from 1e or 3e or some other system)
So, other than advice on how to run a game, what of use *is* in the DMG? (it'll be about 2 weeks until I see the books)
Lanefan