Intel Can't Ship Their Own Driver With Their MeeGo OS
With the introduction of Intel's Poulsbo (GMA 500) chipset it marked a point at which Intel's Linux graphics support was no longer stellar, but as they had outsourced the graphics IP from Imagination Technologies, they could not provide an open-source driver stack like they do with their in-house IGPs.
Not only was this Intel Poulsbo Linux driver closed-source, but the level of support was appalling and it was a bloody mess of a situation. The overall situation since has only become worse and even MeeGo (their own Linux OS) will be shipping without Intel's EMGD driver.
The Intel Poulsbo DRM was open-source, but it was rejected from the mainline Linux kernel since the user-space X.Org Poulsbo driver remained a binary blob.