This tablet netbook sets itself apart with an attractive touch interface, but it’s held back by slow performance, a small hard drive, and cramped keyboard.

The T91 uses the Atom Z520 CPU, widely considered to have better battery life, but at the cost of inferior performance to the N270/N280.

If you are curious how the T91 compares with other netbooks in size, Liliputing posted a nice series of photos of the T91 alongside with the Eee PC 1000H and the Lenovo S10.

According to Asus, the Eee PC T91 is the world’s smallest and slimmest touch PC with dimensions of just 8.77 x 6.39 x 0.98-1.10 inches. Weighing a very svelte 2.11 lbs (slightly less than even the 1008HA), the T91 has an 8.9 inch screen and will come with Windows XP and up to 5 hours of battery life.

Pre-order the Asus Eee PC T91 8.9-Inch Black Tablet Netbook

More detailed specifications on the T91:

• Display: 8.9-inch Gloss LED-Backlit WSVGA touch screen (1024×600)
• Operating System: Genuine Microsoft Windows XP Home
• CPU: Intel Atom Z520
• Wireless Data Network: WLAN 802.11b/g/n (draft 2.4GHz n) and Bluetooth2.1 + EDR
• Memory: 1 GB DDR2 SO-DIMM (upgradeable up to 2 GB)
• Storage: 52 GB Hybrid Storage (16 GB SSD + 16 GB SD Card + 20 GB Eee online Storage**)
• Camera: 0.3 Megapixel
• Audio: Stereo Speakers, Hi-Definition Audio CODEC, Digital Array Microphone
• Card Reader: 2-in-1 MMC/SD(SDHC)
• Input/Output: 1 (D-sub 15-pin for External Monitor) VGA Connector, 2 x USB 2.0, 1 x LAN RJ-45, 2 x Audio Jack (Head Phone/ Mic-in)
• Battery: Li-Polymer Battery, 5-hours*
• Dimensions: 8.77 x 6.39 x 0.98~1.10 inches
• Weight: 2.11lbs (with battery)