After switching to CyanogenMod 7 from MIUI on my Galaxy S2, the smart dialer and an awesome file manager were what I was missing in CM the most. The dialer in CyanogenMod 7 and many other ROMs/UIs do not have a T9 predictive mode.
exDialer is a smart dialer application with features and design very similar to MIUI’s dialer. It has a neat white dial pad with call log integrated inside. It also includes exContacts, an app to browsing and managing your contacts which is, again, a clone of MIUI’s contacts app.