The PengPod tablet, which allows for dual-booting Google's Android and Ubuntu/Linaro on an ARM-based tablet, is becoming a reality after it was successfully crowd-funded.
While the PengPod calls itself the "true Linux tablet" and it's interesting that it will support both Android and Ubuntu/Linaro, it isn't too interesting from just a end-user who just wants a compelling Linux tablet. The PengPod isn't shipping until early next year and the hardware inside is already dated by the latest-generation Android/Linux tablets on the market.
The PengPod tablets (there are 7 and 10-inch models) and the PengPod stick are based around an Allwinner A10 SoC. The Chinese SoC has a 1.2GHz single-core Cortex-A8 ARM core, ARM Mali 400 graphics, 1GB of DDR3 memory. and USB 2.0 connectivity. This is compared to the latest-generation ARM SoCs being multi-core Cortex-A9s or even the very new goods (such as the Samsung Chromebook) using the high-performance Cortex-A15s.