The Inquirer takes a look at why Intel decided to jump out of the entry-level 915G chipset business. They say that this was one of the most important announcements of the year for the graphics market. Some companies will get a significant boost because of this decision.
The second key point was the i915G's lack of support for all of the future Longhorn–Vista Aeroglass desktop interface. Intel 915G and its GMA 900 could not get Microsoft's imprimatur on it. You can have an idea that Intel is very nasty in persuading anyone including Microsoft but we learned after hard lobbying it simply could not persuade the Vole, and Microsoft didn’t want to lower the bar at any cost. Interestingly enough, Intel's GMA 950 can meet the Aero glass specification and Intel will continue to sell its quite highly priced dual core supporting the i945G chipset.