Rebase highlights several innovative projects, including MongoDB, a C++-written, document-oriented database that bridges the gap between NoSQL tools and traditional relational databases, offering features like automatic data replication and failover, and a comprehensive developer wiki. MongoDB's flexibility is enhanced with numerous drivers and the option to fork it on GitHub. The update also introduces nLess, a .NET 3.5 port of LessCSS that brings mixins, variables, and math operations to CSS, and pbrt-v2, a C++-based Physically Based Rendering engine for creating advanced graphics, accompanied by a contest for producing book cover images. Additionally, it presents jaml, a JavaScript templating engine inspired by HAML, offering a simplified way to manipulate the DOM without complex syntax, and defender, a Ruby API wrapper for the spam-fighting API Defensio, which includes comprehensive documentation and provides an engaging game-like metaphor for defeating spam.