If you like NeoPixel strips you'll luv these 8mm diffused through-hole NeoPixels. All the single-pin-controlling-hundreds-of-LEDs goodness in a breadboard friendly format. Each LED looks just like your classic through-hole 8mm RGB LED with 4 legs, but instead of just red/green/blue there's a little chip inside that can control the LED with high speed PWM for 24-bit color. 

Power them with 5V and chain them together, tying the Data-Out pin of one to the Data-in of the previous one in the chain. If you're using an Arduino, you can control these LEDs with our wonderfully-written Neopixel library for Arduino. Note that these are "RGB" instead of "GRB" format used in the 5050-sized LEDs you are so used to. Check in the NeoPixel example code for how to swap the colors automagically. 

ALSO NOTE THAT ADAFRUIT RECOMMENDS THAT A 300 - 500 ohm RESISTOR BE ADDED BEFORE THE FIRST "DATA IN".  PLEASE REFER TO THE BEST PRACTICES GUIDE IN THE ADAFRUIT NEOPIXEL UBERGUIDE.

These are running at 800KHz. We don't have a datasheet for the LEDs themselves yet, see the photos above for the pinouts.
Dimensions:

• LED Height: 11mm / 0.4"
• LED Diameter (at base): 8mm / 0.35"
• Length of Pins: 27mm / 1"
• Weight: 0.8g