The original url of the Quakeworld Trick Archive isnt available anymore So what happened ? I think that was a pretty good site for beginners to see whats possible and for oldschoolers to learn new useful tricks. If there are any hosting problems I would mirror it on qwscene.net. Just drop a line ...

i think all the demos is included in nquake if i'm not mistaken

Yes, demos come with the nquake package and are installed in qw\demos\tricks.