A “list question” is a question that generates an endless list of answers, none of them better or worse than any other. They're questions that ask things like “list all the things I could do with a sword” or “tell me all the spells that are cool” or “what do you use for an initiative method?”. For a longer answer see What are list questions?. (Since 2012ish “list question” has been outdated terminology; it's frequently misunderstood to mean questions answered with a bulleted list.)
Should we allow and encourage list/collection questions here? The tradition on the trilogy has been to allow a very few and force them to be CW questions. It seems, like many of the other betas, we are collecting quite a few early on.
These questions aren't popular with the management, and I feel that they devalue the site. They add clutter, they abuse voting, and they don't interest experts. Beyond that they can be found everywhere else on the web (List of Gurps Books, List of Campaign Settings, etc).
I believe we need to commit early on, that we're going to close these questions as they come up. What does the community think?
Edit: as time has gone on SE management consensus is against pure list questions, but @GraceNote has a good post on how they can be transformed from lists into good questions - I recommend reading it.