CSS

"As with most things, a logical and structured approach is the best way to go. Therefore I have put together 10 quick tips (in no special order) to help make your CSS coding as pain-free as possible."

The basic idea of Nifty Corners is to get some coulored lines to get the rounded effect."

Full article: Nifty Corners: rounded corners without images

How to emulate frames using CSS: CSS Frames

How to make accessible rounded tab menus using CSS.

• Fast Rollovers Without Preload from The WellStyled Workshop
• CSS and round corners: Making accessible menu tabs from Webcredible
• Accessible Image-Tab Rollovers from SimpleBits
• Pure CSS menus