Arduino Due A000062 and Yun A000008, Two Newest Arduino Development Boards
Two of the newer Arduino boards that are available are the Due (sometimes mistaken as the Duo, as a follow-on to the Uno) and the YUN.
Arduino Due
Let’s start by discussing the Due. The Due is the first Arduino that uses a 32-bit ARM processor. Most Arduinos have 8-bit AVR processors.
The Arduino Due runs at 84 MHz, whereas most Arduinos to date run at 16 MHz, also the Due has more memory, with 512 kB of flash memory. One drawback of the Arduino Due is that it operates at 3.3 V instead of 5 V. This in and of itself is not bad thing, it’s actually good thing for various reasons, it’s just that many of the existing Arduino shields and accessories will be incompatible with the Arduino Due because of this.
The Arduino Due also has quite a few other capabilities that the other Arduinos do not. One is that it contains 12 bit analog to digital conversion, this gives your analog input 4096 different possible values, whereas most of the existing Arduinos only provide for 1024 input levels.
Current pricing for the Arduino Due A000062 
If you are just getting started with Arduino, you may be interested in the Sams Teach YourselfArduino Programming in 24 Hours 
Another feature unique to the Arduino Due is a pair of digital to analog conversion outputs (DAC1 and DAC2), it is the only Arduino to date that has analog outputs. This means that Arduino projects which require sound are a bit easier to accomplish, but the analog outputs are useful for many things.
The digital to analog conversion outputs also have 12 bits of resolution.
The Arduino Due has better interrupt capabilities, all of the Arduinos to date only support interrupts on certain pins, however the Due will allow you to attach an interrupt on any digital input pin. With 54 input pins, this represents a lot of flexibility. As you can see the Arduino due is quite a capable little device.
Arduino YUN
The newest member of the Arduino family is the Arduino Yun; The Yun is quite a bit different from any other Arduino to date. It is also built around a 32-bit processor like the Due.
It operates at 5 V like most other Arduinos, except for the Due, and has a footprint that is very similar to the Arduino Leonardo. It has 20 digital I/O pins, seven PWM channels, and 12 analog input channels.
The biggest difference with the Yun is that it also contains an Atheros processor which can run a custom version of Linux named Linio.
The Yun also has Ethernet and Wi-Fi support, and a microSD connection.
I mentioned how the Arduino Due has more capabilities for sound applications than most of the other Arduinos, well the Arduino Yun takes that to an even higher level. The Yun will also be excellent for data logging projects, even though there are other Arduinos with that capability.
Current pricing for the Arduino A000008 Yun ATmega32u4 Microcontroller Board
To get started with your YUN, we recommend the Internet of Things with the Arduino Yún
There it is. A brief summary of two of the more interesting Arduinos.
Visit the Arduino website for more complete details and specifications:
Arduino Due
Arduino Yun
Related Article: Low Power Arduino (Micro, Nano)
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