What type of affiliate program you looking for? I mean in which niche? I don't think there is much affiliate programs related to humor.
Pictures/posters. of comedy acts old and new.
Cd's of comedians
Dvd's live shows and comedy movies.
Sponsor a joke haven't seen your site if setup one joke per page this joke was brought to you by......permanent
If you have a voting setup Joke of the week sponsor on index one week
If you have weekly or daily email get a joke a dayweek in your email the more subscribers you have the the more you can charge for email ad.
Contact comedy clubs to give who they have preforming that week in there club.
Hope this helps.
You might try one or more of the CPM ad networks.
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I swear, by my life and my love of it, that I will never live for the sake of another man, nor ask another man to live for mine.
Advertise a personalized cartoons service and have a chat with my friend Jamie - Cartoonist For Hire - Hire A Cartoonist - Freelance Cartoonist - Commission A Cartoonist about his prices so you can put a mark up on his prices without mentioning his site on yours.
Just tell him Keith D of Double T Ted's® sent you over. Two of my own characters HostTed and Hilton Paris appear in the header logo on his site so he will know who sent you over to him as I also host his site to and he mentions me by name on his home page to.
With that amount of traffic he should be interested in some sort arrangement with you.