Curated Module Lists
The PowerShell gallery should allow users to create "lists" of modules (think of it as an Amazon wish list).
A user could create a "favorites" list and add modules and scripts to it to keep track of their favorites over time (maybe even "subscribe" to notifications of new releases of things on the list).
A user could also create a "user management modules" list or a "stretching PowerShell's limits" list or a "should have been in the box" list, or a "things I use in my prompt" list ...
But most importantly, users should be able to SHARE those lists, and other users should be able to download and install a list (maybe something like Install-Module -ListName MyPrompt -Author Jaykul).
Additionally, if you could show a count of how many users have added the module to at least one list, and a count of how many lists it's on, these would potentially be useful non-download metrics for popularity.
It would be awesome if there was a way to get additional sorting metrics for the gallery (downloads in the last week, vs. all-time, perhaps), and this would give you several possible additional metrics (users, lists, and the "all time" vs "last month" or "last week" to get hotness).