The icons built yesterday for annotations don't work at any size below 32 pixels; they're too complicated. A better approach would be to model them on the annotation icons in the Markin program (a yellow box with a black border and the letter A, with the top left corner folded down). This should be fairly easy to do in SVG. We probably don't need the Add icon -- we can use the simple Annotation icon.
It would also be helpful to find a square-ish speech bubble that can be used for comments and similar functions. Rounded bubbles render less effectively into small bitmaps because of anti-aliasing issues.