How Do I Make A “Most Popular” List?

Hello,

I’ve actually got 4 questions that I believe will all have a very similar answer.

I want to know how to code a WP_Query list (I Think). I have four different list that I want to make.

1st List – 5 most viewed and/or commented posts from the last X# of days
2nd list – 5 most viewded and/or commented posts for all time.
3rd list – Top X# of commentors listed in decending order from most # of comments to least.
4th list – 5 most recent comentors listed in order front most recent to least recent. W/ link to post and portion of comment text.

I would like to make template files out of each of these so I can call and style them in various places in my template.

Thanks so much for you help!