http://blogs.msdn.com/manders/archive/2009/03/13/xna-roundline-code-released-on-codeplex.aspxSince there still seems to be a lot of interest in it, I've updated my RoundLine code and released it on CodePlex . Here are the major changes from earlier versions: Updated for XNA Game Studio 3.0 Uses shader instancing for improved performance: overen-USCommunityServer 2.1 SP1 (Build: 61025.2)