Download Archive of Old Google Apps (APKs) for G1 (1.6 Donut)
Official? No. 

Trusted? Well that depends on who you trust. Rootzwiki has a list of the GApps packages for all Android versions. 

Now for the rant part: Google understandably and thankfully doesn't support old versions.  The ROI is getting lower and lower with the older platforms. No person in their right mind would support 1.6 when they have 4.1 out there and a newer version in the works.