This is a simple example-snippet of a form with a dynamic add-row feature, done with jQuery. You can also submit the form and see the results. The form re-displays all entered values. You can extend it to max. 10 rows. Take a look at the source, there you will find all you need to know:

• Demo: dyn_form_rows.php
• Source: dyn_form_rows.phps

I love jQuery!

I have just discovered the tools section of the Smashing Magazine with very interesting articles like these ones:

• 50 Extremely Useful PHP Tools
• 75 (Really) Useful JavaScript Techniques
• 15 Helpful In-Browser Web Development Tools
• 50 Useful Design Tools For Beautiful Web Typography
• 15 Useful Project Management Tools

And there are many more!