Writer Steven Johnson does this in a single document he calls a “spark file”—every time he has an idea, he adds it to the file, and then he revisits the list every couple of months.

Whether it’s to organize ideas for a project (me); to have material to turn to for inspiration when you get stuck (Adam Alter); to save idea-sparks without getting distracted by them in the moment (Steven Johnson and Dan Pink); or to create a receptacle of fleeting impressions (Rachel Ingalls), I think having a repository for interesting things you... See more