Rounded corners are very popular in web design and definitely give a professional look to web sites that are using them. If you’re looking for a Rounded Corners Tab Menu consider checking the following list.
In this tutorial from Rubiqube the CSS techniques are used to create a category based menu. It is specially designed from WordPress but it can be adapted to any website.
This is a step-by-step tutorial from Woork that uses the CSS sliding door effect.
This is a nice collection of five free complete CSS Tab Menus that use the sliding door technique allowing the tabs to expand horizontally depending on the length of the contained text. Each menu (blue, red, green, grey or black) is available for download.
This is a tutorial from DojoCampus that shows you how you can make a fancy rounded tab menu using a sprite image and a couple of CSS Classes.
This is a step by step tutorial that uses the sliding doors technique to create rounded tabs showing the ability of CSS to layer background images allowing them to slide over each other to create certain effects.