I own a D1 and have successfully rooted, installed custom ROMs, themes, kernels, etc., with no problems.
I made this post to ensure I can use the same process for the DX, which is running 2.2.
Process for my D1:
Root via Easyroot.apk with purchased serial
Install RM w/Clockwork Mod + Superuser
Download ROM via RM and install
Will this process also work with the DX?