I'd like to dd a GPS module to this, which is the smallest and best option I hve?

Look into Adafruit GPS modules compatible with the arduino. I know they have shield GPS modules for the uno so you can probably find an unshielded version to use on the micro. Basically go to adafruit.com and take a look. They also helped design the micro so best chance for compatibility.

What are the dimensions (and weight) of the board? Amazon only seems to list the packaging dimensions.

From the Arduino web sitec http://arduino.cc/en/Main/ArduinoBoardMicro "The maximum length and width of the Micro PCB are 4.8cm and 1.77cm respectively, with the USB connector extending beyond the former dimension." Height about 20mm (defined by header pins) Weight 7 g. Also check out the Nano board.

does it have the I2C bus ?

Hi, yes! Here is a tutorial with more info: http://tronixstuff.com/2010/10/20/tutorial-arduino-and-the-i2c-bus/

is this as powerful as the Arduino mega?

Simply, no. But powerful for its small size.

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🚀 Tiny Board, Massive Possibilities: Power Your Next-Gen IoT & Wearable Innovations!

VERSATILE I O ARSENAL - 24 digital pins with 12 PWM outputs and 4 analog inputs let you build anything from wearables to robots.
POWERHOUSE PERFORMANCE - 16MHz ATmega32U4 processor delivers smooth, efficient multitasking for your embedded projects.
ULTIMATE COMPACT DESIGN - Small footprint fits perfectly in tight spaces and wearable tech, giving you freedom to innovate anywhere.
PLUG PLAY CONNECTIVITY - Pre-soldered headers and integrated Micro-USB port make setup effortless—just connect and code.
SEAMLESS ARDUINO IDE SUPPORT - Fully compatible with Arduino’s intuitive IDE for rapid prototyping and debugging without hassle.

The Arduino Micro with Headers [A000053] is a compact ATmega32U4-based microcontroller board featuring a 16MHz clock, 32KB Flash, and built-in USB HID support. With 24 digital I/O pins, pre-soldered headers, and a breadboard-friendly design, it’s perfect for embedded systems, wearable tech, and IoT projects, all fully supported by the Arduino IDE for seamless development.

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Processor	core_i3
RAM	2 KB SRAM
Memory Speed	16 MHz
Wireless Type	Bluetooth
Brand	Arduino
Series	A000053
Item model number	A000053
Item Weight	0.317 ounces
Product Dimensions	3.94 x 1.97 x 3.15 inches
Item Dimensions LxWxH	3.94 x 1.97 x 3.15 inches
Color	Green
Computer Memory Type	SRAM
Manufacturer	Arduino
ASIN	B00AFY2S56
Is Discontinued By Manufacturer	No
Date First Available	March 29, 2009

ArduinoMicro with Headers [A000053] – Compact ATmega32U4-Based Microcontroller Board, USB HID Support, Ideal for Embedded & Wearable Projects

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