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The config file will give you the ability to create up to 15 modes that can be cycled through and displayed on a series of 4 LEDs.  You can of course create more modes than this but you'll then need to plug in a monitor to get visual feedback on the mode you are currently using.  The config will allow you to set a wide variety of options in terms of input/output modes, arduinoBoy settings, transposes, arpeggiation, and whatever else I can think to add.  Basic, any setting that can be changed should also be available as a flag for the config file.

As for built-in audio vs. USB audio, I won't personally be coding anything for this.  However, any USB audio device that is compatible with ARM Linux should work on the device without any hassle.  Really, once you plug a powered USB hub into the RasPi, you'll find that most USB gear will work immediately.  I had my keyboard controller sending MIDI over USB with zero installation. I'll figure out a way of routing the MIDI from ALSA to the RasberryBoy software and at that point ANY software that uses standard MIDI should be able to use the MIDI in/out through both the DIN 5 and Game Boy link port.

I'll be using logic level shifting for my device, so all the 3V3 that the RasPi enjoys will be 5V IO on the business end.

That being said, at least for MIDI the 3V3 should work with most devices.  So anyone building one at how who plans to use only MIDI will have that option.  However, the IO for the Game Boy link port has to be 5V, so there's that.

The RasPi uses standard USB 5v power delivered through either the usb-micro power port or, on newer revisions, delivered through the USB host ports themselves.  You need a power supply capable of at least 700mA, but I find I generally need more (I'm using a 1A charger).

Really, the RasPi charging is a great solution because there are a million different cell phone chargers that will work perfectly with the RasPi.  You can even get those portable phone chargers and use it as a totally premade portable battery solution!  Of course, if you want to make your own power source you can just throw 5v across the power/ground pins and you're on your way.

Update: I'll be a little busy this week, starting a new job and finishing up a previous project, but I hope to get to brass tacks immediately next weekend on getting a functional version of this software working!  I've wrangled some school friends into being code monkeys, so hopefully we'll have a basic template of functionality uploaded for you guys soon!

Yes, that's the main function of the device; MIDI connectivity for chiptune hardware.

As for price, I'll be releasing all the schematics and software for free.  I doubt I'll be building or selling them, though.  The base cost of a Raspberry Pi is $35 and the additional components so far total around $7-8. However, some of the components that I'm using will are extremely tiny, QFN surface-mount parts that the average person won't want to use.  You also need an SD card to boot from.

It's certainly not going to be cheaper than a bare-bones arduinoboy build.  I build my arduinoBoy for little more than cost of the atmel chip ($5-6?) the DIN connectors ($1.75 ea?) and the Game Boy Link Cable ($5?).  For syncing your Game Boy, it does a hell of a lot!  However, I think the power and relatively low cost of the RasPi warrants some experimentation.

With a standard Game Boy link cable.  I've soldered up a basic logic level shifter to allow the Game Boy to talk to the RasPi.  Tomorrow I'll be picking up a dead DMG from a friend and pulling the link port socket out to give to the RasPi.  Then it's as simple as stringing any old link cable between a Game Boy and a RasPi and getting the Wiring [program] ported and running on the arduino.

I'm debating the idea of porting 'arduinoboy' to C. However, the fact is the arduinoBoy code is in great working order and the existing Wiring code can run with a few modifications on the RasPi.  Unless I see issues with performance, this won't be high priority.

Wheeee! Most Lethargic Dancers Team 2012.

I suppose that makes sense, but it's good to know that it's a technical possibility on a platform like the PSP which I use most often.