There is a certain design project going on, called G.A.U.N.T.L.E.T. (Generally Accessible Universal Nomadic Tactile Low-power Electronic Typist).
Two people have given this name to a DIY (do-it-yourself) glove keyboard, based on the Arduino Lulypad.
It is the best attempt (that we've seen) at placing the 26 letters of the alphabet within thumb distance.
The gauntlet keyboard has its own website already, but it isn't too likely for a viable marketable implementation to appear, not without major refinements.
Still, the idea, at least, has merit. It could be a good fit for Project Glass
and other wearable displays, at least until voice recognition evolves to Sci-Fi levels. Phones can also prove a handful sometimes, especially the really big ones, so there are definitely situations where a keyboard glove could come in, dare we say it, handy.