My projects:

• PlanetMath - A math-centric knowledge community. Features a collaborative mathematics "encyclopedia" and rich forum facilities. This has also split into the Noosphere project, which is just the underlying software of PlanetMath. Also see the planning wiki for PlanetMath and related projects (this is the place to go if you're curious or want to help out).
• Quality Metrics - Challenging implicit assumptions about search engines in a digital libraries context by performing user studies, and building a generalizable DL search component based on what we learn. Funded by IMLS. Conducted in cooperation with Virginia Tech.
• MetaCombine - A Mellon-funded digital library project. The goal is to more meaningfully combine digital library resources and services. This includes classification, semantic clustering, visualization, and federated services.
• OCKHAM - An NSF-funded project to build a federated framework for libraries and digital libraries. The impetus is to get the NSDL's resources into traditional libraries, but OCKHAM should also be useful for DL-to-DL federation.
• CITIDEL - A computer science education digital library. Aiming to be huge. (This project supported me through my master's).
• ircquotes.org - A fun site for user-submitted memorable quotes from internet chat (such as IRC). Meant to illustrate "intelligent" online community design, in terms of personalization and organization. Logan Hanks did most of the implementation.
• ntc-sucks.com - A site dedicated to taking my former home networking provider to task. Got covered recently in the Collegiate Times, a Virginia Tech/Blacksburg newspaper. Never had much time to work on this, looking for someone else to take it over!