TutorialZine has written a tutorial and shown us how to create a “Who is online” widget with PHP, MySQL and jQuery. It will display the number of visitors, currently viewing your site, and it will even be able to detect the country your visitors are from and display it in a slide out panel.

Having access to real time data on your site userbase is a dream to any webmaster. Tools like Google Analytics give a great perspective on your site

Ketchup is a slim jQuery Plugin that validates your forms. It aims to be very flexible and extendable for its appearance and functionality. Although Ketchup is designed to be styled and extended by you, it already looks tasty and gives you the most common validations by default. If there is no validation fits your needs, you can always write your own too. You can make your own ketchup with ease.

URL: http://demos.usejquery.com/ketchup-plugin/

Securimage is an open-source free PHP Captcha script for generating complex images and CAPTCHA codes to protect forms from spam and abuse. It can be easily added into existing forms on your website to provide protection from spam bots.

It can run on most any webserver as long as you have PHP installed, and GD support within PHP. Securimage does everything from generate complicated CAPTCHA images to making sure the code the user entered was correct.

URL: http://www.phpcaptcha.org/?page_id=12

Twitter is running a new homepage with clean and easy design for a while already. Look at the top right of Twitter

CSS Globe has shown us a little trick that you can apply to your forms to enhance user experience. We will display editable form data (indented to be edited, updated) as regular tabular data intended for reading.

This works on most modern browsers with pure CSS, but we need a little bit of Javascript in order to make this work on Internet Explorer though, because of the lack of support for :focus pseudo-class.

URL: http://cssglobe.com/articles/editable_fields/