The PHP performance & profiling project aims to provide a free and easy to use set of classes to monitor and analyze PHP scripts and projects.
The intention is to enable PHP developers to locate perfomance issues and redundancies without external tools or IDE plugins. The collected data will be available in various formats, allowing you to process it in whatever way you prefer. Nontheless: A visualization class will be one of the goals.
If you'd like to volunteer in this GPL project, especially if you are familiar with SVG (scalable vector graphics) or PHP performance analysis, visit the project page at sourceforge.net.
Oli (mail to: spassguerilla (at) users.sourceforge.net)