I am a FastLED newbe, I am working with arduino with the standard libary of adafruit (of the neopixels) is there a guide somewhere where i can get started with Fast LED? is it an alternative libary? or what is it then?
you guys make some nice stuff 
See http://fastled.io. FastLED is not an alternative library for addressable LED’s… It is THE Fast LED library and it supports a LOT more than just Neopixels.
yes, in simple terms it is a library that can replace adafruit’s library for controlling NeoPixels.
It is able to process data faster, supports many types of IC’s (not just neopixels), and has a lot better toolsets for dealing with creating content (fast math functions, color, wave generation, FPS management, etc…).
download and install the library, and try running a few example sketches with about 10-20 neopixels that demonstrate turning on/off and setting color of leds (firstlight is a good one for on/off). then, go read a bit about what you dont understand in the code (which for firstlight is very well documented, actually).
best to start reading here:
if you get stuck, ask questions here. Daniel is around somewhere and is very helpful with the lower-level questions!
Pim,
Welcome to FastLED! Check these links as starting points…
…and of course, the examples that come with the library itself.
-frenchy