Yeah many video editors support them. Some screws with the speed, though. Also, for optimal quality you need to resize them in nearest possible mode instead of bi-linear or the like, else it might look blurry compared to the rest of the video. Example:
Most gifs resized from 96x64 or 192x128 to 640x480 using bilinear logic:
Most gifs resized from 96x64 or 192x128 to 720x480 and from 320x240 to 640x480 using nearest pixel logic:
It looks more pixelated but it looks closer to the original thing. However some editors like Windows Movie Maker won't support that. I generally use 720x480 resolution nowadays. 640x480 is a bit stretched vertically.
