I've just learned that the Herschel Science Archive has been opened up to the world, so any old Tom, Dick or Harry can download the data and start writing their own Nature papers. Well, okay, most of the data is (are) proprietary, but there's quite a bit of public data on there. Here are some links.
- Herschel Science Archive
- Herschel Data Processing
- HIPE software: stable release, or development builds (installation instructions)