I'll frontpage a node if it makes me say "That's a good question", whether or not I know the answer. This typically doesn't apply to FAQish bits, although at this point I acknowledge the need to repeat FAQ questions once in a while.
For SoPW, I tend to favor questions that have focus on one particular interest or concern. An example would be Win32::API access violation, though I didn't fp it.

Meditations are a little less clear, typically most thought provoking posts -- things that really do inspire some meditation on a topic. I think meditations is the appropriate section for golfing, since golf inspires very deep thought about (typically) trivial problems and the way the language works.

I have not approved or frontpaged any discussion node that talks about voting unfairness, votes or other sensitive topics. I still believe in the school of dice-rolling and knock-taking, and besides, what does it matter in the end, eh?
Most suggestions for improvements are approved. Ones that are innovative or profound make the front page. Things that point out hidden alcoves and sliding bookcases in the monastery are also good.

I don't frontpage my own nodes.