Can I safely remove "Android keyboard" if I have installed an alternative keyboard application?
Hi Martin Tapankov:  Yes.  It is safe to remove the stock Android Keyboard application if you have already installed an alternative IME (Input Method Editor) on your phone.  You may go to "Settings->Local and text->Text settings->Select input method" to select ONLY ONE preferred IME and then reboot your phone to ensure it automatically picks up your IME.  Please bear in mind you should NOT install or move your preferred IME application to the SD card because, after your phone is restarted, the default IME will revert to Android keyboard (if you still have the stock Android Keyboard application installed) or your phone will show a lot of ForceCloses (if you have uninstalled the stock Android Keyboard application).  Good Luck!

FYI, I have already done this before on my Samsung Galaxy S Epic 4G (SPH-D700) which comes with a hardware slide-out keyboard, so my risk factor has been much smaller than yours.  :-)