I've found Evernote with it's web clipper to be great for this. Anything I figure I might want someday, but I don't know exactly when or why, goes into my EN a

I've found Evernote with it's web clipper to be great for this. Anything I figure I might want someday, but I don't know exactly when or why, goes into my EN archive. The full text is searchable, so it's like having Google for only stuff that I've found interesting in the past. (And the clipper can even add results from your library to search engine results, so you can re-find things even when you're not specifically looking.)