I know what you mean. I actually had no idea they were called 'streaklets'. I just knew that I'd seen some presets and demos of Particular that had them, so I opened Particular, and whaddya know, a particle called 'Streaklet'. I've personally never used it before, but this thread, plus as you have pointed out, they're very popular, makes me want to.
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"98% of all computer issues can be solved by simply pressing 'F1'."
Steve Brame
creative illusions Productions