Sliding Doors of CSS
http://alistapart.com/articles/slidingdoors/

CSS Design: Creating Custom Corners & Borders

http://alistapart.com/articles/customcorners/
Rounded corners in CSS
http://kalsey.com/2003/07/rounded_corners_in_css/
CSS and Round Corners: Build Boxes with Curves
http://www.sitepoint.com/article/css-round-corners-boxes-curves

This tutorial will demonstrate creating a 1px diameter table outline with rounded corners
http://www.andymartin.clara.net/round_corn/index.htm