We have developed a prototypic Web-accessible GIS solution for K-12 science education and citizen-based watershed monitoring. The server side consists of ArcView and ArcView IMS running on Windows NT workstation. The client is built around MapCafe. The client interface, which runs through a standard Web browser, supports standard MapCafe calls to the server and also uploading and viewing of "shape" or georeferenced spreadsheet data. Preliminary supporting tutorials and classroom materials are in development. In this paper we will present the tool's key features, describe our approach to design and prototyping, and outline plans for further development of Map-IT! and its integration into the middle and high school science curriculum.