I have slight pain in both Achilles today. I believe this was caused by doing steep hill repeats on Tuesday followed by running down and up several very steep hills on Wednesday. Had I followed the hill repeat workout with a follow up run on a flat course, I doubt it would have resulted in the pains I'm feeling today.
I figure it's not your standard overuse injury but rather an acute consequence of a single false move, so I'll just let it heal, which I think I can do without changing my training. On the bright side, I believe that my Achilles tendons will be toughened by the episode, putting me at a lower risk for future Achilles injuries.