[pmoriarty]

I wasn't arguing that digital drawings wre searchable, but that typed text was.

Still, there are ways to make drawing somewhat searchable too.

The (typed) names of the drawings you make are searchable, as are the tags (if you've used any, and you should), and their location on your filesystem. If there's some writing on the same page as the drawing, that's potentially OCR'able, and then searchable. Finally, you could always combine drawings with typed text, wich will be searchable.