Samsung Galaxy 3 Kyrillos' Rom

You must know how to use odin!
Recommended firmware before flash: Any
Optional make a backup of your data (with Titanium).
Go in download mode (Vol down + Home + Power or from the power menu).
Open Odin, click reset files, select ops, tick one package and select the "Flash_this_as_one-package.tar" file.
Click Start. The phone will reboot in recovery. WIPE DATA! (The wipe process may take a minute+, dont worry. The boot process may be long too, but dont worry its normal!!)
Optional, Partition your sd!
-Make a backup of your sdcard, enter CWM recovery and go to advanced => partition sd. Choose the sizes you want. After the partition completes, wipe data and reboot
Install titanium and go to titanium backup's preferences and select the default install location => internal. Then do your restore...
Enjoy!

Based on the newest firmware XXJPS
Ultra Fast Rom
Deodexed & Zipaligned
App2SD+ [Extra space for apps] & Swap [Extra RAM]
Overclock up to 1.3Ghz [Thanks to Marcellusbe]
Gingerbread Feel and Colors
Unnecessary Apps Removed
Jit enabled
CWM Recovery
Partitions: System/Cache=ext2, Data=ext4, Efs=rfs
3 Launchers [LauncherPro, ADW & Touchwiz] & 3 Keyboards [Samsung, Swype & Gingerbread]
5 Lockscreens to choose from [Android, Epic, Puzzle, Samsung, Rotary]
And many more...