Now Samsung Galaxy S 2 is again in news, this time for the firmware leaked. A leaked build of Android 2.3.4 has been released for the GS2, prepping the phone for Google Talk video. This update fixed screen on lag when you wake up via Home Button, brings Google Talk Video chat support and also carry with it some bug fixes.
Want to know how to install the ROM, go the the below links and Download the latest Firmware from there.
Source: XDA-Developers forum