[AT&T Samsung Galaxy S II Skyrocket SGH-I727] romracer:
Changelog:

Alien #6

Reverted brightness changes.

Added "Internet call settings" for SIP settings in Phone options.

Added "Network mode selection" (will not stick across reboots with AT&T modems but will stick for the current session).

Added "Stay Awake" development options (will not stick across reboots).

Alien #5.5 (full wipe required due to NFC and BT fixes)

Fixed NFC FC. Breaks Google Wallet, but that didn't really work anyway.

Hopefully fixed Bluetooth.

Added Roboto FlipFont (Settings -> Display -> Screen display -> Font style)

General file cleanup.

No change to frameworks, so the PDroid links in first post and any battery mods you've already cooked will still work fine.

Alien #5 (full wipe recommended if you use NFC)

No more Carrier IQ! It is still technically embedded in framework, but it is completely disabled. This allows MMS to work fine! After the first boot, you should wait about 10 minutes and then reboot. You can then verify there is no iqd process or Agent running. See known issues below if it somehow re-enables.

All system APKs have been re-packed. This solves a problem that occurred with Alien #4 and the "Android System" using more battery than intended. For the nerds, it was constantly running a garbage collection process for ~1 hour after a reboot.

Updated to use my stock kernel. This allows you to use BLN by simply installing the app from the Market. If you have no desire to use BLN, that's fine - no extra battery, etc is used by default.

Bluetooth fixes for HID devices (may fix other issues too).

NFC APK was resigned. This allows you to install the Google Wallet attachment in the first post. Unfortunately, our phone does not have a SecureElement so its unusable. But I have made this change in case some people have SIM cards with SecureElements in them (this is how ISIS will work).

Other minor changes and tweaks based on feedback in this thread.

Known issues:

Flash player seems finicky when installing the ROM. Uninstalling and re-installing through the Market seems to fix it.

Changing the Wi-Fi sleep policy increases battery drain. This is common across many phones and ROMs.

If choosing power off from the Power menu just reboots the phone, you have the first version of Alien #4. Apply the update zip from here in CWM or update to Alien #5+.

If Carrier IQ is re-enabled, simply reboot the phone which will trigger the NoCIQ script again. Wait roughly 5 minutes and reboot once more and Carrier IQ should be gone again. I've never personally seen Carrier IQ be re-enabled, but it is theoretically possible for AT&T to do.

If you are having FC bombardment issues after a reboot and you have ever installed Alien #3, then you will need to use stock recovery (3e) to factory reset, reinstall CWM and finally flash Alien #4 or newer. Wiping data in CWM, factory reset in Settings -> Privacy, etc will NOT work!

Miscellaneous:

If you want to enable "Preferred install location" in Settings -> Applications, run the following through an ADB shell and reboot:

sqlite3 /data/data/com.android.providers.settings/databases/settings.db 'update system set value="1" where name="set_install_location";'