I stumbled across Vanadium while reading I believe Ajaxian's blog.  Vanadium is an excellent client side form validator for the jQuery framework.  Check it out.
http://vanadiumjs.com/
Here is some sample syntax.  Say you wanted to verify that a user entered in at least four characters in a textbox.
<input class=":max_length;4" type="text">
Vanadium uses the class HTML attribute to set the validation rule.  Many rules are supported.
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