Samsung announced the Galaxy Tab GT-P1000 Android tablet at IFA in Berlin. The first available iPad challenger in the tablet market.  The Samsung Galaxy Tab is powered by Android 2.2 and features a 7-inch touchscreen. Other features of the Galaxy Tab include Cortex A8 1.0GHz CPU, 3 MP Camera with Auto-Focus and LED Flash, 1.3MP front camera for Video Telephony, 16GB memory, Gyroscope…