"Good luck"

[krepsen.livejournal.com]

How can you say "Good luck" in russian?

question!

[voltaireontoast.livejournal.com]

I have a question. Actually, I had two, but the last good luck post answered this for me.

'им до лампочки' - A phrase my Russian teacher told me to casually throw in our oral exam, which I did. And I was told it meant 'they couldn't care less' idiomatically.

Am I right in thinking that literally, this has something to do with lamps? Little lamps?

Where does that come from? I'm very intrigued. Thanks, guys.