Will Steinmetz
Notific8 is a notification plug-in inspired by the notifications introduced in Windows 8 with some web ready restyling and customizations. Notific8 has built in themes and is easy to create new themes for. The plug-in was born from a want for a simply designed yet modern and stylish notification system. The plug-in is also designed to scale based on the page's font-size setting (it was designed for the default of 100%/16px as the default).
messages – A lightweight jQuery plugin for showing messages around fields and other HTML elements.
Kolge Pratik
Use the messages plugin for showing beautiful messages around form fields or other HTML elements. You can show and hide multiple messages on a single field.
Chandra Sekhar N
A jump-start for Form tooltips and messages using JQuery.