I've changed industries as well as changing jobs. There's plenty to learn about car repairs, estimating, insurance companies, paint and mechanics. There's plenty to learn about procedures and conventions. There's plenty to learn about Glassmatix design, architecture, file formats and source code.
As well as the source code, I have identified 114 documents that need reading; so far I've read 14. The development standards document is excellent, in that it focuses on reuse, promotes FxCop, NUnit, NDoc and SourceSafe, and just so happens to insist on using the curly brace style I prefer.