Just flashed this rom yesterday, and it's been fun to use. It's not 100% complete. 4G doesn't work, mms receive doesn't work (you can send), no front camera, and no HDMI. The rear camera can only do 5MP at this point, and I set the video camera to 720p, and now it force closes every time I try to access it. I don't use the video camera anyway, so it's no real loss for me. But, aside from those issues, it's rather stable. I haven't had any FCs, or app crashes yet.
This is the rom that was supposed to be the iOS port on the MyTouch 3G.
Check the thread below for download links, and screenshots.
[ROM] MIUI_EVO-v1.21 super-fast (bt audio works) more stable - xda-developers