I have fond memories of the "Elastic Bullets" trail (all the cool kids had it on their websites).

Most of my early javascript snippets came from javascript.internet.com [1], but I found a copy on yaldex [2]. More classics available there and javascript-fx.com [3]

[1] http://web.archive.org/web/20000619201149/http://javascript....

[2] http://www.yaldex.com/FSMessages/ElasticBullets.htm

[3] http://javascript-fx.com/mouse_trail/index.html