Pick-up Puns - Musically-oriented wordplay with modestly sexual overtones.
Planet Mike Puns - Covers monkey cloning, Gandhi, beer, and flunking English.
Pun of the Day - Archive of puns in categories such as food, transportation, families, education, and work. Plus a one-liner pun every week day.
PunLiners.com - Covers family, law, cows, mathematics and conmen. Offers a free newsletter and links.
Punpunpun.com - Has information about the annual O. Henry Punoff in Austin, Texas, Punster of the Year awards, links, and bookshelf. Accepts contributions.
Puns for the ESL/EFL Classroom - Designed to help teachers of English as a Second Language. Also covers misuse of English. Requests submissions.
Puns Galore - A searchable database of puns collected from the internet.
Shaggy Pun Test - Involves taking a test about 100+ corruptions of phrases. Submissions are accepted.
Steve Brooks Puns - The six-time winner of the O. Henry Pun-off World Championship offers "Inhale to the Chief", "Tex-Mexexistentialism" and "Lincoln's Texasburg Address".