I'd like to announce Pyarie, a modular modeling environment. Pyarie provides an environment for defining and solving systems of ordinary differential equations. It was developed for my use in hydrologic and ecological modeling, but is being used to model both chemical and aeronautical systems amoung others. Pyarie is defined to allow modeling in a programming environment with minimal initial programming skill that the user can enter equations into a class template and optionally define look-up tables and other functions for each state variable. Solver classes are provided and optimizers are being implemented now. Basically, it provides a way for non-programmers to create and run models without using "black box" modeling environments. The system is highly extendable and can be used as either a functional environment for the non-programmer, or similiarly to a Python module for the programmer. Pyarie is housed on SourceForge, with a homepage at http://pyarie.wikisophia.org The Pyarie-users mailing list is live for help and discussion. Cheers, -John Metta Bioresource Engineering and Geography Oregon State University