This is based off of the same work done by spacemoose1 for the CDMA Tabs. A russian developer has compiled a kernel and rom for use on GSM Tabs. A simple way to check if your Galaxy Tab is GSM or CDMA is by checking for a SIM card slot. GSM devices have one and CDMA devices lack one.
Obviously proceed with caution if you want to alpha test the glorious Android 3.0 port. The port is anything but functional at its current stage.