Meanwhile

My Nexus One has retired. Again. Hopefully the HTC will send me another replicant soon.
While waiting it back I decided to change the system to a Tattoo on my old good Kaiser because I get tired of that blurry resized image and already get used to the sharp and crispy off the Nexus.
Tattoo system has the same resolution as Kaiser - 320x200, so it should fit.
The install process went smoothly (I took the source from here). Then I found the Wi-Fi does not work. I took an update from here, but standard /sdcard/andboot/androidupdate.tar update did not help. Comparing I found out the sysinit.rc is still different, and placed it manually. Then WiFi started working.
Current issue - the market client can not connect to the server, throws
DEBUG/vending(5478): com.android.vending.api.FatalCommunicationException: Sent a bad request.

Repair update: HTC sends the replacement phone overnight in the same day as they receive the broken one. Outstanding!

unit replaced

Received replaced "Nexus One" from HTC. Gosh, that was swift! They used an overnight FedEx in both ways, and I got a working phone back in two(!) business days.
HTC customer service is outstanding!!!
Thank you HTC and thank you Google!