Each issue of NewType magazine usually comes with a spread, article, appendix, or feature on something usually that's related to the cover, or often times not anything related to the cover. The .hack series is no exception and has had quit a bit of items included. Keep in mind however; the Japanese and American issues have different posting dates, with usually the American (USA) version behind by 1 month. Here's the ones I can 100% confirm as follows:
Japanese May 2003
Bonus Item - .hack//SIGN, .hack//, .hack//Legend of Twilight poster