Yes I Can!

How-to Install Android 4.0 ICS On Galaxy S II And Galaxy S

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Step 1: Download required ICS file to your computer.

Step 2: Connect your device via USB and transfer the file to the root of your phone’s storage media.

Step 3: Turn off your phone after transfer is complete. Now, turn off your device.

Step 4: Boot into ClockworkMod Recovery by holding Volume Up + Home + Power button simultaneously until the main menu shows up on screen.

Step 5: Scroll down to mounts and storage and format /system. After that, you must also format /data and /cache.

Go back to menu and then wipe data / factory reset.

Step 6: From main menu: install zip from sdcard > choose zip from sdcard > [name of file you downloaded in step 1] to flash ICS to your device.