SGS2 I9100 Guide: Must Have Rooted Apps

After you flash your SGS2 with custom rooted kernel, you might want to ask, what kind of apps which actually utilize root.
I believe apps such CWM Manager, and Superuser should be available with most custom ROM out there, so i won't describe it anymore.
Here's some apps you might find useful

SGS2 I9100 Guide: Download Mode & Recovery Mode

Samsung Galaxy S2 has three different boot method.
Normal boot method done by using power button.
You can also hard shutdown the device by holding the power button for 8 seconds, so you don't need to do battery removal method. 

SGS2 I9100 Guide: Updating to Latest Firmware

Samsung Galaxy S2 firmware can be updated by user by connecting the device to PC with KIES software installed.
You can download latest KIES from here.

SGS2 I9100 Guide: Installing Driver

My Samsung Galaxy S2 wasn't bundled with Driver CD.
But it's not really that hard to find the driver. 

SGS2 I9100: Chainfire3D and Anti Aliasing

I recently bought Samsung Galaxy S2 and I am content with SGS2 performance.
But as a human, i always ask for something more..