What's MIUI Pronunciation???

It's M-I-U-I

The UI stands for user interface, forget the MI--Someone said it a month or so ago, but I am too old to remember such things :)
M(obile) I(nternet) U(ser) I(nterface)

So pronounced M I U I

"MY U EYE". "MIUI" Machine Independent User Interface.

Sent from my PC36100 using the miuiandroid.com forum app
The UI part stands for User Interface

So it has to be pronounced as such.

"My UI".
Yep. My U I is how I've always pronounced it.

Sent from my Captivate using MIUI 1.5.20 (until the next update ;))