This specific forum allows users to upload mov, avi, mpeg, swf large sized gifs for showcase.
Another method is to upload your work to youtube and use the youtube-attachment tags to display your work within your posts, so users can just click to play.
Check out VB CODE LIST for more information on how to post youtube links
Please only post only use this option for animations/motion graphics.
Any exploitation of this service to host non-art related files will get your account & files removed.