A well-raised point. Not colourblind here, but as someone who remembers the days when visual cues were used, I feel your pain.

FWIW, I find using `tab` to bounce around links in the main text helps. Further than that, if you use `vi` on sundays, both pentadactyl and vimperator have a "hints" mode to navigate links by keyboard, which also helpfully highlights them.

It would be nice if web designers weren't such idiots about accessibility, but these options make fending for yourself a bit less frustrating.