If you’re not familiar with the MIUI series of custom ROMs, you really should be. MIUI is based on the CyanogenMod project, but taken to a whole new level of customization and beautification. The latest MIUI release is version 4 based on CyanogenMod 9 and Android 4.0 Ice Cream Sandwich.
This release combines the code of the CM9 project, along with the a leaked Samsung kernel and some various other bits to form a (nearly) fully functional ROM. This is only a Release Candidate and there remain a couple of minor issues such as less than stellar battery life, some theme issues and getting the file manager to read the SD card. Other than that, it’s a full Android 4.0 ROM with a gorgeous look.
Right now it’s only available for the international version of the Galaxy S II, the i9100, but hopefully we’ll be seeing MIUI ROMs on other SGS2 variants soon. Head over to the XDA Developers link for more info and downloads.