Pigboy

Collection of categorised jokes and original humour articles. Includes a forum, regular mailing list and an agony uncle.
http://www.pigboy.co.uk/

Humor of Phil Kaufman

One-liners, stories and links. Original content.
http://www.jokemeister.iwarp.com/

The Laugh Lab

A scientific experiment undertaken by the University of Hertfordshire in the UK to find the world's funniest joke.
http://www.laughlab.co.uk/

Gocount.com

Providing original jokes on news and celebrities.
http://www.gocount.com/

Tony Follari

Original jokes arranged by category.
http://www.tonyfollari.com/

Cantu Jokes

A collection of original jokes updated monthly. Features an ezine of comedy and a book.
http://humormall.com/jokes/freejokes.shtml