Yep, I saw loads of adverts for it in the city centre yesterday. Moto are really pushing it which is good. It's picking up celeb support as well, Kim Kardashian just got one.
[ROM] CyanogenMod - Keeping You Legal For Less (BETA) [UPDATED 10/6 - v4.1.999] - Page 29 - Android Community Forums
Basically you have to download a file from HTC's website and put both the HTC file and Cyan's ROM on your sdcard.
You boot into recovery mode, flash the HTC file, and then when it reboots after installing the HTC file, you hold down home to get straight back into recovery mode and then flash the Cyan ROM. It's very important that you don't allow to the phone to boot up to the OS after flashing the HTC file, or you will lose root, and it's a MUCH more complicated method from that point to regain it.
From Cyan 4.0.4, I did two backups of everything (one using MyBackupPro and one using Backup for Root Users) and then I booted into recovery mode, made a Nandroid backup, then flashed the HTC file followed by the Cyan ROM.
It's incredibly fast and way more stable.