Ok, so there are light-up knitting needles and even light-up crochet hooks (what, you haven't seen those yet? tres cool. But I don't have any for myself yet, saw them at www.mountain-shadow-ranch.net -- no affiliation, yada yada).
But, what I want is: a light-up sock darner. That way I can put it in the foot when I kitchener!
I throw the idea out there for anyone else to run with, since I'm not going to find time to make one myself. Have fun with it!