This is the coolest captcha i have come across to date, i really get wound up with the text captchas, they seem to be getting harder to decode, anyhow we have here a nice visual captcha that works be dragging and dropping the requested image onto the the hot spot

ajax script example here
ajax script demo here
ajax script download here

Smoot is a very cool flowchart creator with configurable tool pallets. Google maps and Google earth integration

ajax script example here
ajax script demo here
ajax script download here

sonspring use the jquery toolkit to produce some most excellent dynamic content widgets they are also collapsible

ajax script example here
ajax script demo here
ajax script download here

This dragable RSS script is quite good, it dynamically allows users to drag and drop the rss content boxes on the fly

ajax script example here
ajax script demo here
ajax script download here

Dragable content script featuring a cool cookie position remember feature

ajax script example here
ajax script demo here
ajax script download here

Dynamically move words around the screen to create or solve a social puzzle, nice humorous script

ajax script example here
ajax script demo here
ajax script download here