"How Did You Hear About Us?" on Registration
Asks new members how they found your site when they register and shows the answer in a column on the Users screen.
Snippet Library
Users snippets for WordPress
Snippets for user accounts, roles and profiles: extra profile fields, new columns in the users list, last-login tracking and tighter control of what each role can do. Handy for membership sites, client sites and teams with many authors.