Validating forms as users type is a nice feature for users, it lets them see when they make a mistake.

An ajax live form validation library, LiveValidation is not only a form validation library, it can also be used for other types of validations.

The naming conventions and parameters of the validations are similar to those found in the Ruby on Rails framework, and as such is the perfect client-side companion. Don’t worry if you dont use Ruby on Rails though, LiveValidation can be used anywhere you like, is simple to learn, and a joy to use.

LiveValidation has standalone and prototype.js versions for download.

Flash tweening animations can be done easier & with less coding using Movie Clip Tweening Prototypes.

Most features of Movie Clip Tweening Prototypes are from Fuse, which is a powerful Flash animation toolset.

There are also free .fla files of  very nice examples built with the prototype.

Note: This is an ActionScript 2 prototype.

A benchmark test of Movie Clip Tweening Prototypes & some other famous classes can be found here.