Gif high quality?

I've been seeing people making these awesome quality gif videos with a really small size. I was just wondering, how do you guys do them? what program do you use? Any help would be appreciated.
Regards,
A-MAN

Its done by trimming the video clip (movie maker can be used)
And then opening it in Photoshop ., it will open as different frames, select the frame's duration, remove any if you want, and then click on "Save for web.." there you can select some settings for reducing its size and save it as gif.. But ask itachi uchiha, he knows better, as i dont make them

Using Quicktime to convert the video from a .fmv to a .avi is much better in my opinion.

Yea .avi conversion is important step..

Alright, thanx a lot buddies. I will use it to show some progress for the next demo.

Good luck A-man!