The recent brigade of 10.1-inch tablets had rendered the 7-inch form factor redundant until Samsung released a new 7.7-inch Galaxy Tab at the ongoing trade show IFA in Germany.

Samsung's first Android tablet offering was a 7-inch Galaxy Tab which was released at the same event a year earlier. A lot has changed since then and multiple 7-inch tablets which held promise have come and are struggling to leave a mark. Key 7-inch tablets include the Dell Streak 7, RIM Playbook and HTC Flyer.

However, all that is due to change as Samsung unveiled a new form-factor with the Galaxy Tab 7.7. The new 7.7-inch Android tablet takes a leaf from its kin Galaxy Tab 10.1 and 8.9, flaunting a lean figure measuring 0.31-inch in thickness and weighs a mere 0.73 pounds. In comparison the Galaxy Tab 10.1 is 0.33-inch thick and weighs 1.31 pounds.

Galaxy Tab 7.7 is powered by a 1.4GHz dual-core processor and sports a 7.7-inch Super AMOLED display with 1280x800 screen resolution. It offers up to 10 hours in battery life and comes in 16GB/32GB and 64GB configurations.

Galaxy Tab 7.7 with such specifications makes the whole breed of 7-inch tablets look obsolete.

Here are the specifications of other 7-inch tablets:

RIM which also adopted the 7-inch form factor for its QNX powered tablet PlayBook. The tablet features a 7-inch display with 1024x600 screen resolution. It runs on TI OMAP 1GHz dual-core processor and comes in 8/16/32/64 GB internal memory configuration. PlayBook is 0.4-inch thick and weighs about 0.9 pounds. It returns 6 hours in battery life.

HTC also adopted the 7-inch form factor for its flagship Android tablet Flyer. Flyer runs on Android Gingerbread juice and is powered by a Snapdragon 1GHz single-core processor. Its 7-inch display has a screen resolution of 1024x600. It offers 32GB internal memory. It weighs 0.9 pounds and is 0.52-inch thick. Flyer returns a battery life of 8 hours. HTC Flyer offers a strong differentiator as it offers a stylus which helps with note-taking. The technology is called HTC Scribe Technology which also uses a feature called Timemark which enables a user to capture the audio of a meeting in line with the written notes. Thus tapping on a word in the notes instantly takes a user to that exact place in time in the audio recording of the meeting.

The 7-inch tablet from Dell runs on Android 2.2 or Froyo. It sports 800x480 screen resolution and is powered by NVIDIA Tegra 2 dual-core processor. It comes with 16GB internal memory, weighs about 1 pound and is 0.49-inch thick.