A little different we cannot use EXT4 feature of this ROM but its still SUPER fast.
Here is the link to the rom:
http://xdaforums.com/showthread.php?t=964672.
If your already on Stock JVB. Flash This.
Let it boot up normally. (Here is where its a little tricky).
Do not use any of the special kernel features you will see in your App Drawer (i.e. the EXT4 App)
Then reboot into Download, Flash X'Cals kernel on top and it should work. It didnt work for me the first time, then I tried again and it worked.
But with or without the EXT4 this thing is SUPER fast and has a lot of cool features but is oriented for the Captivate. Just wait till X'Cal implements Voodoo Lagfix and all our special features it will be great.