Useful resources about Gifs
Information about Gif format - on Wikipedia - Wikipedia article about Graphics Interchange Format (GIF).
Image hosting - Imageshack is very useful site, it allows to host your gif image on the web if you have not a hosting. Upload simply you image and you will get get a corresponding URL. Free use - take advantage.
Collection of animated gifs - free collection of animated gifs in different categories.
Gif banner design - Simple tool from the same developer, that allows to create gif banners easily.