Good resources for short one-liner jokes are GotLines.com, OneLineFun.com and Reader's Digest. Got Lines offers a wide variety of one-liners including Halloween jokes, animal jokes and work jokes. Other sections of the website also provide pick up lines, quotes and insults.
One Line Fun has separate sections for specific topics, special events and new one-liners. Users rate the lines up or down, making it easy to find the funniest jokes to share with friends and family.
Reader's Digest is a long standing source of one-line jokes from comedians and readers. Its website, RD.com, is a vast source of historic and new jokes.