The device handling would be much improved. Especially for USB. It would make the iLiad an interesting device for controlling hardware. I work for Code Mercenaries (
http://www.codemercs.com). For our IOWarrior we only have a 2.6 driver for example. The slow screen update may be hampering some applications, but controlling and storing the data for later display is well within its power. Many robots work with phones or PDAs as computer.
Please port the current 2.6.23 kernel. I do know that USB support is in hot development. USB OTG is not yet fully supported so the newest kernel is a requirement.