Having only recently marked its return to the handheld computing space with the iPAQ Glisten, HP seems intent on forging ahead with more hardware in the coming year. The above trademark applications -- filed in September and October 2009 -- mark out some very broad categories, but we can narrow them down a little with the help of some context. Given all the industry excitement over tablet devices, the Zeen could well be the name of a forthcoming slate-shaped machine and accompanying software, while Airlife seems to be planted firmly in the smartphone arena. The moniker suggests a s
