That has reg expression checks for phone, zip, email. Comparison checks for email and password. Bonus: masking and forcing letters and numbers only options.
I would like
I like jQuery tools validator, it uses html 5 input types, support for server validation and a lot of other resources. http://flowplayer.org/tools/demos/validator/index.html
The best validation plugin is Jorns here. Coupled with the metadata plugin it provides a powerful clientside validation framework.
Multipart form demo here
Please go and read and view the examples then ask any specific issues that crop up along the way in your solution.
You can try bValidator: http://code.google.com/p/bvalidator/
I want my error messages to float independently of my HTML forms. Here's another validation alternative that looks promising:
https://github.com/posabsolute/jQuery-Validation-Engine