Turn any webform into a powerful wizard with the jQuery FormToWizard plugin, by dividing your form content in different fieldsets.
jQuery googlemap.js is a jQuery and google maps plugin.
JQuery shiftCheckbox plugin allows the users to select the range of checkboxes by clicking on one checkbox and then SHIFT+clicking on the last desired checkbox. All checkboxes in between the first and the last gets checked.
viewer is a very small mootools class that lets you create image and content slideshows.