Here are some tricks and techniques to make corners of your content boxes round shaped. Some uses only CSS while some uses images as well.

- Nifty Corners Cube
Nifty Corners Cube are a solution to get rounded corners without images, and this third version is build by three main components:
- A javascript file, named “niftycornerscube.js”
- A CSS file, named “niftycorners.css”
- The javascript calls specific for the pages

- Rounded corners in CSS by Kalsey
This is one of the best tricks to create rounded corners with CSS. It requires very less CSS and XHTML code and only four images.

- Rounded corners in CSS by virtuelvis.com
This is another solution for rounded corners with less XHTML and CSS Code.

- Rounded Corners with CSS and JavaScript by Sitepoint
This article discuss the pros and cons of some common techniques and introduce a new technique that utilises both CSS and JavaScript.

- Rounded Corners Without Images
This article will show you how to make rounded corners without images. That’s right. Without images.

- Neuroticweb CSS Round Box Generator
A very easy to use and quick tool that generates the XHTML and CSS of Round Box. It also generates the required images.

- Spiffy Corners - Purely CSS Rounded Corners
Spiffy Corners is a simple tool to generate the CSS and HTML you need to create anti-aliased corners without using images or javascript.