Answers with low scores are faded out. This is good. However, it would be nice to have the ability to temporarily un-fade such answers should we want to have an easier time reading them (for example, maybe there's a status-declined answer with a score in the -50's that you're having trouble reading). Rollover seems like a reasonable way to do this, or maybe clicking the answer's text.
This fades in/out on mouseover/out, and makes it permanent if you click it.
Here's my version of Manishearth's user script fix:
It's a bit klugey, but it has the advantage of not assuming anything about how downvoted answers are styled on each site (since that turns out not to be as consistent as one might hope).
I've included the code above in a collection of small user script fixes that I'm calling the Stack Overflow Unofficial Patch. Please feel welcome to give it a try!
Ps. Actually, it would almost be possible to fix this purely in CSS by adding appropriate