Just awhile back, everyone can only rely on SD card to run Android ROM on HTC HD2 but recently and just recently, NAND-build has taken a great leap ahead.

NAND is a slower memory type (ROM) which is designed to hold data even after the phone is turned off. This is where your Windows Mobile operating system is stored, said Darkstone from XDA. Now that we can have Android on NAND, we can omit Windows Mobile from the phone altogether and use only Android! Of course, not everyone want just Android when some of them heavily relies on Windows.
So anyway, it has been 1 day since I start using Android on NAND. I am running this ROM RAFDROID HD 1.0 (3 Jan) which is made by a XDA forumer rafpigna. So far so good. Ringtones, wallpapers, everything is working fine. Even the HTCSense feature is working! I can friggin make my phone ring by just browsing to HTCSense website. It made me laugh out loud.