i would love to see this as well! I have an atrix and was thinking of selling it for a Samsung GSII but I love this phone too much to do so. MIUI would make it complete! Somebody please bring this ROM to the Atrix
US AT&T Atrix is unlocked. I have mine unlocked and am willing to test, and I know tons of people on XDA would be willing to help test. I have went back to using my Nexus 1 after playing with the 2.3 MIUI. The Atrix really needs a polished ROM like this. I tried MIUI in it's beggining stages and wasn't really impressed, but I am blown away with how far it has come. If someone is actually going to work on porting this, start a thread on XDA and you will have lots of testers to help and devs familiar with working with the Tegra2 chipset.