Nah, I like the PocketCHIP thingy which has a screen and keyboard. I currently mostly use a Gameboy (the original style in a grey box, running LSDJ) for portable music fun. But, a more realistically programmable toy with the same basic form factor (pocket sized computer with a hardware keyboard) running Linux would be ideal. I could use a programming environment I'm familiar with, and work directly on the device itself (no need for cross-compiling and such). I don't really think of my Gameboy as programmable, despite knowing vaguely how to put together system to build for it and how to run an emulator for testing. I just don't want to program within those limitations, even though I appreciate the art that goes into doing so (and think very highly of the author of LSDJ).
The very small PC form factor (like a NUC or brix) requires a monitor and a keyboard. A tablet with a keyboard more closely fits the bill, but also isn't ideal. I have a tablet, but can't really develop directly on the device, as far as I know. I want a self-contained pocket sized toy for tinkering with, without need for an external build system. CHIP with the Pocket add-on fits that bill perfectly, at a great price.
This is why I loved the original Motorola Droid series, and wish we could get another modern Android phone with the slide-out, Sidekick style keyboard.
I had a Sidekick II, I which I liked a lot for the time. And, I miss my G1 for the same reason. I had two of them; the original G1 and the original Google Devel phone. Loved them both, but sold the G1 when I got the dev phone for free, and gave away the dev phone when I got a Nexus One. Have missed having a keyboard ever since. I've finally found that a 8"+ tablet has a large enough soft keyboard for me to be able to type at a reasonable speed without ridiculous numbers of typos.
If the platform itself were more hackable, I'd just go grab an old Droid or similar. I don't really need modern for this particular task (though building Android apps has only recently gotten nice on a level comparable to building for Linux). But, running an unmodified Linux is non-trivial, and running an old Android version is also challenging. But, maybe I shouldn't worry so much about it, and just pick up and old Android phone that's known to be root-able and can run CM, disable the radio, and build the stuff I want to play with for Android. Unfortunately, there aren't any competent existing music trackers written in Java that I'm aware of.
