Bonsai: Make a meme generator. Enter an image URL, and captions to go on the top and bottom using the .keyup event, .text() and .attr().

Packetbook: Add error message to their sign up page if any of the form fields are filled out incorrectly using the .submit(). Leave all form fields blank and click the Create account button.

Threadly: is creating a commenting service using the .keypress event, .text(), and .appendTo.. Type a comment into the comment box and click the Post button, then display comment in the first list. If you didn't enter any comment, you will see the error.