If you compare the Transmeta Efficeon chip with Intel's Centrino, then it's (arguably) faster and cooler. But what about comparing it with an ARM?- is anybody going to build an Efficeon based phone or PDA?

No.

Perhaps you have the pulse of the majority of the market right, but I would absolutely LOVE my pda or phone to run windows or linux apps and hold all the data that is on my laptop (which serves as my desktop as well). As a matter of fact, I wish my pda was my desktop so that I had seamless access to all of my local data and programs where-ever I was. The ability to plug my pda into a clamshell and have it become my laptop, or to plug it into some kind of docking station and have it become my desktop, with a larger monitor and keyboard and an external power supply sounds, to me, very attractive. I think it will sell.

I think it would sell.

The question is whether it could be built! Here's the problem: in a box the size of an iPaq, you have to get a battery almost the same size as the one you'd need to run a ThinkPad.

The PC, even if you shrink it down to the size of an iPaq, still chews power. But if you shrink it down, people expect you to shrink the battery down, too.

A battery the size of an iPaq battery would probably keep the Oqo going for about two hours. Even with an Efficeon.